Word Forms of "unbelievable" (4 forms)

Adjective

Form	Word
Comparative	more unbelievable
Comparative, Nonstandard, Rare	unbelievabler
Nonstandard, Rare, Superlative	unbelievablest
Superlative	most unbelievable

Comparativemore unbelievable

Comparative, Nonstandard, Rareunbelievabler

Nonstandard, Rare, Superlativeunbelievablest

Superlativemost unbelievable

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