あっさり (translations)→ brightly carelessly casual dryly easily entirely freely handsomely impatiently just matter-of-factly off-hand quickly readiness short shortly simply succinctly thinly unceremoniously willing
さりげなく (translations)→ absently careless casually casualness covert covertly delicately discreet discreetly everyday inconspicuous innocently nonchalantly restrained unobtrusively unselfconsciously vague
なんとなく (translations)→ actually bit certain connotation distinct general imprecisely inexplicably intuitively little mildly moderately rather really seem somehow somewhat vaguely