D defs.my
Entry 3 senses Webster, 1913

Happy

/(hăp"py̆)/ · Hap·py · IPA /ˈhæp.i/
01 a. Favored by hap, luck, or fortune; lucky; fortunate; successful; prosperous; satisfying desire; as, a happy expedient; a happy effort; a hap…
  1. 1.
    Favored by hap, luck, or fortune; lucky; fortunate; successful; prosperous; satisfying desire; as, a happy expedient; a happy effort; a happy venture; a happy omen.
    “Chymists have been more happy in finding experiments than the causes of them.” Boyle.
  2. 2.
    Experiencing the effect of favorable fortune; having the feeling arising from the consciousness of well-being or of enjoyment; enjoying good of any kind, as peace, tranquillity, comfort; contented; joyous; as, happy hours, happy thoughts.
    Happy is that people, whose God is the Lord.” — Ps. cxliv. 15.
    “The learned is happy Nature to explore, The fool is happy that he knows no more.” Pope.
  3. 3.
    Dexterous; ready; apt; felicitous.
    “One gentleman is happy at a reply, another excels in a in a rejoinder.” Swift.
Phrases & compounds
Happy family — a collection of animals of different and hostile propensities living peaceably together in one cage. Used ironically of conventional alliances of persons who are in fact mutually repugnant.
Happy-go-lucky — trusting to hap or luck; improvident; easy-going.