The most wrinkled or full of small folds and creases.
Superlative form of 'crinkly,' derived from 'crinkle' (Middle English, possibly from Old English 'crinca' meaning to bend or wind), with the suffix '-y' added to create an adjective, then '-est' for the superlative form.
English loves making superlatives by adding '-est,' but 'crinkliest' shows how we can stack suffixes: crinkle → crinkly → crinklier → crinkliest, each step adding more semantic intensity until something is at maximum wrinkledness.
Complete word intelligence in one call. Free tier — 50 lookups/day.