The comparatives and superlatives of these adjectives usually have three or more syllables and are formed by adding more and most.
| ancient | more ancient | most ancient |
| beautiful | more beautiful | most beautiful |
| brilliant | more brilliant | most brilliant |
| careful | more careful | most careful |
| careless | more careless | most careless |
| cheerful | more cheerful | most cheerful |
| comfortable | more comfortable | most comfortable |
| dangerous | more dangerous | most dangerous |
| delightful | more delightful | most delightful |
| difficult | more difficult | most difficult |
| enjoyable | more enjoyable | most enjoyable |
| expensive | more expensive | most expensive |
| foolish | more foolish | most foolish |
| forgetful | more forgetful | most forgetful |
| frightening | more frightening | most frightening |
| generous | more generous | most generous |
| handsome | more handsome | most handsome |
| helpful | more helpful | most helpful |
| ignorant | more ignorant | most ignorant |
| important | more important | most important |
| intelligent | more intelligent | most intelligent |
| interesting | more interesting | most interesting |
| pleasant | more pleasant | most pleasant |
| powerful | more powerful | most powerful |
| prosperous | more prosperous | most prosperous |
| sensible | more sensible | most sensible |
| terrible | more terrible | most terrible |
| thoughtful | more thoughtful | most thoughtful |
| unusual | more unusual | most unusual |
| useful | more useful | most useful |
| valuable | more valuable | most valuable |
| wonderful | more wonderful | most wonderful |