IPA: /ˈɪŋkləs/
KK: /ˈɪŋkləs/
Describing something that does not contain or use ink.
The inkless pen writes smoothly without any ink.
Inkless → It is formed from "ink" (from Old English "ince", meaning a colored fluid used for writing) and "-less" (meaning without). The word "inkless" means without ink or lacking ink.
Think of being 'without' ('-less') the 'colored fluid used for writing' ('ink') — that's why inkless means lacking ink.