IPA: //ˈfaɪərləs//
KK: /ˈfaɪərləs/
Not having or involving fire.
The fireless cooking method is safe for children.
Fireless → It is formed from "fire" (from Old English "fyr", meaning flame or combustion) and "-less" (meaning without). The word "fireless" means without fire or lacking fire.
Think of being 'without' ('-less') 'fire' — that's why fireless means lacking fire.