• adjective:   not practical or realizable; speculative

  Example: "Airy theories about socioeconomic improvement"

• adjective:   having little or no perceptible weight; so light as to resemble air

  Example: "Airy gauze curtains"

• adjective:   open to or abounding in fresh air

  Example: "Airy rooms"

• adjective:   characterized by lightness and insubstantiality; as impalpable or intangible as air

  Example: "An airy apparition"

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