Most longer adjectives (i.e. of two or more syllables) combine with the quantifiers more less to form their comparatives and most'least to form their superlatives. Less can be used with one-syllable adjectives (less big) but more, most and least are not normally used in this way. More is occasionally used with one-syllable adjectives (e g. It's more true to say that British English is influenced by American, rather than the other way round) More/less can never be used in front of a comparative (e.g. happier), nor can most/least be used in front of a superlative (e.g. happiest).
Adjective comparative superlative
pleasanter pleasantest
1 pleasant more pleasant most pleasant
less pleasant least pleasant
2 careful more careful most careful
less careful least careful
expensive
rnost expensive least expensive most bored/boring least bored,bonng |
more expensive less expensive
3 bored'bonng |
more bored/boring less bored'bonng