Learner's definition of HAPPY
1 a : feeling pleasure and enjoyment because of your life, situation, etc.
b : showing or causing feelings of pleasure and enjoyment
She was a very happy child.
I can see that you're not happy in your work. [=I can see that you do not enjoy your work]
You don't look happy. What's the problem?
We're all one big, happy family here.
I'd do anything to make/keep her happy.
She's happy playing with her toys. = She's happy when she plays with her toys.
c not used before a noun : pleased or glad about a particular situation, event, etc.
I could hear the children's happy laughter in the other room.
She had a very happy childhood.
They've had a very happy marriage.
remembering happier times
a happy event/occasion
I was glad the movie had a happy ending.
d : very willing to do something— usually followed by to + verb
We are so happy that you were able to come to the party.
They are not at all happy about the rise in taxes.
He's not happy with the way the project is going.
It's great that he won the scholarship. I'm very happy for him. [=I am glad something good happened to him]
2 — used as part of a greeting or wish for someone on a special holiday or occasion
Happy birthday, Mom!
3 always used before a noun : lucky or fortunate 4 always used before a noun : fitting or suitable