Adjective insouciant has 1 sense
  1. casual, insouciant, nonchalant - marked by blithe unconcern; "an ability to interest casual students"; "showed a casual disregard for cold weather"; "an utterly insouciant financial policy"; "an elegantly insouciant manner"; "drove his car with nonchalant abandon"; "was polite in a teasing nonchalant manner"
    Antonym: concerned (indirect, via unconcerned)
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