cheerfulness UK /ˈt͡ʃɪəfəlnəs/US /ˈt͡ʃɪɹfəlnəs/ noun1 •The state of being cheerful; joy.Or he that exhorteth, on exhortation: he that giueth, let him doe it with simplicitie: hee that ruleth, with diligence: hee that sheweth mercy, with cheerefulnesse. — 1611 formscheerfulnesses