Superlative form of fearful; the most full of fear or most easily frightened.
From 'fearful' plus the superlative suffix '-est,' forming the highest degree of the adjective. Like the comparative, this follows traditional patterns though 'most fearful' is more modern.
Superlatives with '-est' on two-syllable adjectives mark the older, more poetic register of English—Milton might have written 'fearfullest' but modern speakers instinctively say 'most fearful,' showing how grammar changes generationally.
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