Found 2 items, similar to insouciant.
English → English (WordNet) Definition: insouciant insouciant adj : 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” [syn: casual, nonchalant]
English → English (gcide) Definition: Insouciant Insouciant \In`sou`ciant"\, a. [F.] Careless; heedless; indifferent; unconcerned. --J. S. Mill. [1913 Webster]