From Wiktionary, the free dictionary
Probably connected with pumba (“lump; clod of earth”), following a sense of “be lumpish, heavy”.
-pumbaa (infinitive kupumbaa)
- to be foolish, silly, weak-minded, careless, negligent.
pumbaa kazi- take no pains about a job, do it carelessly, be idle
Conjugation of -pumbaa
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Positive present
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-napumbaa
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Subjunctive
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-pumbae
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Negative
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-pumbai
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Imperative singular
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pumbaa
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Infinitives
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Imperatives
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Tensed forms
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Habitual
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hupumbaa
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Positive past
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positive subject concord + -lipumbaa
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Negative past
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negative subject concord + -kupumbaa
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Positive present (positive subject concord + -napumbaa)
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Singular
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Plural
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1st person
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ninapumbaa/napumbaa
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tunapumbaa
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2nd person
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unapumbaa
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mnapumbaa
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3rd person
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m-wa(I/II)
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anapumbaa
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wanapumbaa
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other classes
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positive subject concord + -napumbaa
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Negative present (negative subject concord + -pumbai)
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Singular
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Plural
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1st person
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sipumbai
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hatupumbai
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2nd person
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hupumbai
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hampumbai
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3rd person
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m-wa(I/II)
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hapumbai
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hawapumbai
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other classes
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negative subject concord + -pumbai
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Positive future
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positive subject concord + -tapumbaa
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Negative future
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negative subject concord + -tapumbaa
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Positive subjunctive (positive subject concord + -pumbae)
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Singular
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Plural
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1st person
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nipumbae
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tupumbae
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2nd person
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upumbae
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mpumbae
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3rd person
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m-wa(I/II)
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apumbae
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wapumbae
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other classes
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positive subject concord + -pumbae
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Negative subjunctive
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positive subject concord + -sipumbae
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Positive present conditional
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positive subject concord + -ngepumbaa
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Negative present conditional
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positive subject concord + -singepumbaa
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Positive past conditional
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positive subject concord + -ngalipumbaa
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Negative past conditional
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positive subject concord + -singalipumbaa
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Perfect
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positive subject concord + -mepumbaa
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"Already"
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positive subject concord + -meshapumbaa
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"Not yet"
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negative subject concord + -japumbaa
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"If/When"
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positive subject concord + -kipumbaa
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"If not"
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positive subject concord + -sipopumbaa
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Consecutive
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kapumbaa / positive subject concord + -kapumbaa
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Consecutive subjunctive
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positive subject concord + -kapumbae
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Some forms not commonly seen in modern Standard Swahili are absent from the table. See Appendix:Swahili verbs for more information.
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