Word Forms of "certainly" (4 forms)

Adverb

Form	Word
Comparative	more certainly
Comparative, Obsolete, Rare	certainlier
Obsolete, Rare, Superlative	certainliest
Superlative	most certainly

Comparativemore certainly

Comparative, Obsolete, Rarecertainlier

Obsolete, Rare, Superlativecertainliest

Superlativemost certainly

Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.