Most grey; having the greatest degree of grey color among things being compared.
Superlative form of 'grey' (or 'gray'), formed with the suffix '-est.' Both British 'greyest' and American 'grayest' are standard in their respective varieties.
Single-syllable adjectives almost always use '-est' for superlatives (smallest, fastest, greyest), while longer ones use 'most,' which is a pattern English learners quickly internalize because it's so consistent.
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