(a.) Not capable of being restrained or controlled; as, irrepressible joy\; an irrepressible conflict.

abandoned beaming beyond control blithe blithesome boisterous breachy bright bright and sunny bubbling buoyant cheerful cheery contumacious defiant ebullient effervescent elated enthusiastic eupeptic euphoric exalted exhilarated flushed fractious genial glad gladsome glowing go-go happy high hopeful immoderate in good spirits in high spirits incontinent incorrigible indocile indomitable indulgent insuppressible intemperate intractable laughing lax licentious loose nonrestrictive obstreperous of good cheer optimistic out of control out of hand permissive pleasant radiant rampant recalcitrant refractory reinless resistant resisting restive rhapsodical riant riotous rosy sanguine sanguineous shrewish smiling sparkling sunny unbiddable unbridled unchecked uncoerced uncompelled unconstrained uncontrollable uncontrolled uncurbed unforced ungovernable ungoverned uninhibited unmalleable unmanageable unmastered unmeasured unmoldable unmuzzled unreined unrepressed unreserved unrestrained unrestrictive unruly unstoppable unsubdued unsubmissive unsuppressed wanton wild winsome