Etymology
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airy (adj.)

late 14c., "of the air, containing air, made of air," from air (n.1) + -y (2). Meanings "breezy, exposed to the air, open to currents of air; lofty, high; light, buoyant; flimsy; flippant, jaunty, affectedly lofty; vain; unreal" all are attested by late 16c. From 1620s as "done in the air;" 1640s as "sprightly, light in movement;" 1660s as "visionary, speculative." Disparaging airy-fairy "unrealistic, fanciful" is attested from 1920 (earlier in a sense of "delicate or light as a fairy," which is how Tennyson used it in 1830).

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Definitions of airy

airy (adj.)
open to or abounding in fresh air;
airy rooms
Synonyms: aired
airy (adj.)
not practical or realizable; speculative;
airy theories about socioeconomic improvement
Synonyms: impractical / visionary / Laputan / windy
airy (adj.)
having little or no perceptible weight; so light as to resemble air;
airy gauze curtains
airy (adj.)
characterized by lightness and insubstantiality; as impalpable or intangible as air; "figures light and aeriform come unlooked for and melt away"- Thomas Carlyle;
an airy apparition
Synonyms: aeriform / aerial / aery / ethereal
From wordnet.princeton.edu