Collocations for cheerful - adj.

appear, be, feel, look, seem, sound
become
keep, remain, stay
I'm amazed that she keeps so cheerful.

keep sb
We tried to keep him cheerful.

extremely, fairly, very, etc.
incredibly, remarkably
almost
relentlessly
falsely (esp. AmE)
‘The doctor is on her way,’ said Mrs Morris, sounding falsely cheerful.

Cheerful is used with these nouns:
disposition, face, manner, mood, note, self, smile, voice