IPA: /səˈriːnɪst/
KK: /səˈrinɪst/
The most calm and peaceful; free from disturbance or agitation.
The lake was at its serenest in the early morning, reflecting the clear sky.
Comparative: serener
Superlative: serenest
Serenest → It is formed from "serene" (from Latin "serenus", meaning clear or calm) and the superlative suffix "-est" (meaning most). The word "serenest" means the most calm or clear, indicating the highest degree of serenity.
Think of 'serene' meaning calm or clear, and remember that 'serenest' refers to the most calm or clear state.