IPA: /ˈsʌtəlɪst/
KK: /sʌtəlɪst/
The most delicate or understated in meaning or effect; not obvious or easily noticeable.
She made the subtlest hint about her feelings, which only a few noticed.
Comparative: subtler
Superlative: subtlest
Subtlest → It is formed from "subtle" (from Old French *subtil*, meaning fine or delicate) and the suffix "-est" (indicating the superlative degree). The word "subtlest" means the most delicate or fine in quality or nature.
Think of something that is the 'most delicate' or 'fine' — 'subtle' refers to that quality, and '-est' shows it is the highest degree.