IPA: /ˈstɪfɪʃ/
KK: /ˈstɪfɪʃ/
Somewhat rigid or firm, but not completely stiff.
The fabric felt stiffish, making it difficult to move comfortably.
Stiffish is formed from "stiff" (from Old English "stif", meaning rigid or firm) and "-ish" (meaning having the quality of). The word "stiffish" describes something that has a somewhat stiff quality, but not completely stiff.
Think of something that is 'somewhat rigid' — 'stiff' means rigid, and '-ish' suggests a quality of that rigidity.