diffrwyth

Welsh

Etymology

From di- +‎ ffrwyth.

Adjective

diffrwyth (feminine singular diffrwyth, plural diffrwyth, equative mor ddiffrwyth, comparative mwy diffrwyth, superlative mwyaf diffrwyth)

fruitless, ineffective
Antonym: ffrwythlon

Mutation

Mutated forms of *diffrwyth*
radical	soft	nasal	aspirate
diffrwyth	ddiffrwyth	niffrwyth	unchanged

Note: Certain mutated forms of some words can never occur in standard Welsh.
All possible mutated forms are displayed for convenience.