IPA: /ˈtʃɪn.ləs/
KK: /ˈtʃɪn.ləs/
Describing someone or something that does not have a noticeable chin.
The character in the movie was portrayed as chinless, which added to his comical appearance.
Chinless → It is formed from "chin" (from Old English "cyn", meaning the projecting part of the face below the mouth) and "-less" (meaning without). The word "chinless" describes someone who lacks a chin or has a very small chin.
Think of someone who is 'without' ('-less') a prominent 'chin' — that's what chinless means.