(of a person, behaviour) noisy and cheerful

noisy and mischievous

(especially of a young person) rude and not showing respect

impulsive, brazen

causing or suggesting happiness

happy

(with) a sound of bells

fickle, irresponsible

very excited, enthusiastic

enthusiastic

full of energy, excitement

energetic, enthusiastic

of or like gas

vaporous

of, like, full of, gas

sparkling

light in weight

not heavy

full of life and spirit; gay and cheerful

energetic, active, busy

(of a person) often changing (in opinion, temper etc)

flighty, temperamental

showing courage, determination

lively, vivacious

lively; high-spirited

lively, spirited

(of a liquid) that easily changes into gas or vapour; (of a person, mood) changing quickly or easily from one mood or interest to another

explosive, changeable

having no weight (e.g. as in space)

light