IPA: /ˈtʃɑːrmləs/
KK: /ˈtʃɑrmləs/
Not pleasant or attractive; lacking in charm or appeal.
The charmless hotel left us feeling disappointed and unwelcomed.
Comparative: more charmless
Superlative: most charmless
Charmless → It is formed from "charm" (from Old French *charme*, meaning a magical quality or appeal) and "-less" (meaning without). The word "charmless" means lacking charm or appeal.
Think of someone who is 'without' ('-less') any 'magical quality' ('charm') — that's why charmless means lacking charm.