happy

happy /ˈhæpi/ adjective
happier; happiest
happy
/ˈhæpi/
adjective
happier; happiest
Britannica Dictionary definition of HAPPY
1 
a  : feeling pleasure and enjoyment because of your life, situation, etc.
b  : showing or causing feelings of pleasure and enjoyment
c  not used before a noun : pleased or glad about a particular situation, event, etc.
d  : very willing to do something — usually followed by to + verb
2 
— used as part of a greeting or wish for someone on a special holiday or occasion
3 
always used before a noun : lucky or fortunate
4 
always used before a noun : fitting or suitable

(as) happy as a clam

— see 1clam

happy medium

— see 1medium

happy returns

— see 2return