nicest

1. 1
   adjective

   Superlative of nice.

   It was the nicest hotel we stayed in during the entire trip.

   He has the nicest manners of anyone I have met.

   Note

   One-syllable nice takes the -est ending rather than most, so English says the nicest hotel, not the most nice hotel. The superlative covers every meaning of nice. The nicest person is the friendliest or most pleasant, while the nicest manners points to refinement and propriety. When the sense matters, the noun it describes usually decides which one is meant.

2. 2
   adverbcolloquial

   Superlative of nice.

   Among the children, the youngest behaved nicest at the dinner table.

   She always dressed nicest for the holiday gatherings.

   Note

   The adverb takes its shape from the adjective, because colloquial speech lets nice stand in for nicely: behaved nicest, dressed nicest. That makes it a conversational form, natural in talk but out of place in careful prose. In formal writing, use the regular adverb instead, as in the youngest behaved most nicely.

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