casually Synonyms

nonchalantly unessentially haphazardly indiscriminately unknowingly by the bye by the way lackadaisically languidly lethargically limply listlessly at random at first glance fortuitously vagrantly wanderingly whimsically spontaneously by chance unexpectedly unintentionally incidentally offhanded inadvertently aimlessly breezily lukewarmly en passant unhurriedly unwittingly unpredictably unsystematically unthinkingly untucked worthlessly as a by-product as side effect not profoundly not thoroughly unconcernedly tenuously unceremoniously heedlessly messily nervelessly adventitiously frivolously offhandedly superficially