Characterized by good luck; fortunate. Enjoying, showing, or marked by pleasure, satisfaction, or joy. Being especially well-adapted; felicitous: a happy turn of phrase. Cheerful; willing: happy to help. Characterized by a spontaneous or obsessive inclination to use something. Often used in combination: trigger-happy. Enthusiastic about or involved with to a disproportionate degree. Often used in combination: money-happy; clothes-happy.