IPA: /ˈnaɪsɪst/
KK: /naɪsəst/
The most pleasant or agreeable person or thing.
She is the nicest person I know, always helping others.
Comparative: nicer
Superlative: nicest
Nicest → It is formed from "nice" (from Latin *nescius*, meaning ignorant or unaware) and the suffix "-est" (indicating the superlative degree). The word "nicest" means the most pleasant or agreeable, derived from the idea of being the most unaware of negativity or unpleasantness.
Think of 'nice' as being pleasant or agreeable, and remember that 'nicest' means the most pleasant.