IPA: /ˈkliːnliər/
KK: /ˈklɛnliər/
More clean in appearance or condition than something else.
She kept her room cleanlier than her brother's room.
Cleanlier → It is formed from "clean" (from Old English *clæne*, meaning free from dirt or impurities) and the comparative suffix "-lier" (meaning more). The word "cleanlier" means more clean or having a greater degree of cleanliness.
Think of 'clean' meaning free from dirt, and the '-lier' indicates a greater degree, so 'cleanlier' means more clean.