'charmless' originates from English, formed from the noun 'charm' (from Old French 'charme') and the Old English suffix '-less' (from 'lēas'), where '-less' meant 'without'.

'charm' changed from Latin 'carmen' (meaning 'song, incantation') into Old French 'charme', then into Middle English 'charm'; the suffix '-less' developed from Old English 'lēas' and eventually combined with 'charm' to form the modern English adjective 'charmless'.

Initially, 'charm' (from Latin 'carmen') meant 'song' or 'incantation', but over time it shifted to mean an attractive quality; consequently, 'charmless' came to mean 'without that attractive quality' or 'not pleasing'.