Word Forms of "costly" (4 forms)

Adjective

Form	Word
Comparative	costlier
Comparative	more costly
Superlative	costliest
Superlative	most costly

Comparativecostlier

Comparativemore costly

Superlativecostliest

Superlativemost costly

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