Happy, sunny. Something that makes you happy is
cheery, and people are cheery when they are in a
good mood.
Cheery is
an old fashioned term, and is now used primarily in sarcastic comments, where the word "cheery" actually means "depressing."
As in:
"I heard you
whistling. You must be in a cheery
mood."
Or
sarcastically:
"Hearing about that suicide was definitely cheery."
