Adjektive
jovial [ more jovial ; most jovial ]
lighthearted [ more lighthearted ; most lighthearted ]
elate {feelings & emotions}
riant {feelings & emotions}
laughable {feelings & emotions}
risible {feelings & emotions}
Noun
cheerful {feelings & emotions}, [ more cheerful ; most cheerful]
gay {feelings & emotions}
laugher {feelings & emotions}