airy
adjective
[ ˈɛːri ]
• (of a room or building) spacious, well lit, and well ventilated.
• "the conservatory is light and airy"
• not treating something as serious; casual.
• "her airy unconcern for economy"
Similar:
nonchalant,
casual,
breezy,
flippant,
insouciant,
heedless,
unconsidered,
uncaring,
indifferent,
unthinking,
unworried,
untroubled,
light-hearted,
blithe,
jaunty,
cheerful,
unserious,
insubstantial,