From Wiktionary, the free dictionary
ду́мки • (dúmki) f inan or f inan pl
- inflection of ду́мка (dúmka):
- genitive singular
- nominative/accusative plural
ду́мки • (dúmky) f inan
- genitive singular of ду́мка (dúmka)
думки́ • (dumký) f inan pl
- nominative/accusative/vocative plural of ду́мка (dúmka)