Most awful; superlative form of awful, meaning the most terrible or dreadful.
From awful plus -est suffix for superlative form. Follows the standard English pattern of adding -er and -est for one-syllable and some two-syllable adjectives.
Like 'awfuller,' people today prefer saying 'most awful' instead of 'awfullest,' but both are grammatically correct and follow traditional English word-building rules.
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