(a.) Having, employing, or exerting, a low degree of pressure.

active activist activistic aeolian aerial aeriform aery airish airlike airy alfresco alive animated atmospheric blasty blithesome blowy blustering blusterous blustery boreal bouncing bouncy brisk bubbly buoyant carefree casual cheerful cheery chipper common corky debonair degage drafty draughty ebullient effervescent energetic ethereal exposed favonian flawy free and easy fresh frisky full of go full of life full of pep gusty informal jaunty light light-hearted lighthearted lightsome live lively low-pressure mercurial militant open-air peppy perky pert pneumatic puffy quicksilver relaxed resilient roomy smacking snappy spanking spirited sprightly spry squally tropospheric unconstrained unfussy vivacious windy zingy