Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
devil-may-care is an adjective meaning "cheerfully irresponsible". It carries 2 recorded senses.
cheerfully irresponsible
“carefree with his money”
“freewheeling urban youths”
“had a harum-scarum youth”
marked by a carefree unconventionality or disreputableness
“a cocktail party given by some...raffish bachelors”
Definitions, synonyms and semantic relations for devil-may-care come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.