(a.) Perk; pert; jaunty; trim.

active activist activistic aggressively self-confident airy alive animated biggety bouncing bouncy breezy bright bright-eyed and bushy-tailed brisk bubbly bumptious buoyant carefree cheerful cheery chesty chipper cocky conceited corky debonair ebullient effervescent energetic free and easy frisky full of go full of life full of pep gay immodest invigorated jaunty know-it-all light lighthearted lightsome live lively mercurial militant obtrusive overwise peacockish peacocky peppy perk pert puffed up quicksilver resilient self-conceited self-opinionated smacking smart-alecky snappy spanking spirited sprightly spry stuck-up swelled-headed vigorous vitalized vivacious zingy