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Use more or less plus the adjective (Comparative). Use most or least plus the adjective (superlative) when...
The adjective has two syllables but ends with one of these suffixes: -ish, -ous, -ful,-ic, -ant, -ive, -less, -ing, -like, -ward, -ose, -al, -act, -er or if it has three syllables or more.