adjective

noticeably happy and optimistic.

how can she be so cheerful at six o’clock in the morning?

happy,jolly,merry,bright,glad,sunny,joyful,joyous,light-hearted,in good spirits,in high spirits,sparkling,bubbly,exuberant,ebullient,cock-a-hoop,elated,gleeful,breezy,airy,cheery,sprightly,jaunty,animated,radiant,smiling,grinning,laughing,mirthful,frolicsome,jovial,genial,good-humoured,happy-go-lucky,carefree,unworried,untroubled,without a care in the world,full of the joys of spring,buoyant,optimistic,hopeful,full of hope,positive,content,contented,upbeat,chipper,chirpy,peppy,smiley,sparky,zippy,zingy,bright-eyed and bushy-tailed,full of beans,full of vim and vigour,peart,gay,jocund,gladsome,blithe,blithesome,of good cheer