Superlative form of crooked; the most crooked, bent, or curved.
From crooked plus the superlative suffix -est, the traditional English superlative formation, though 'most crooked' is preferred in contemporary usage.
Like 'crookeder,' the crookedest uses the old -est superlative form—these archaic forms remind us that English is actively simplifying its grammar, moving toward longer phrases instead of inflections.
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