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One that is insubstantial or impractical: "They'd wanted him for Ambassador in Paris but he'd turned it down; he'd no patience with the airy-fairies” ( John le Carré).
(noun)
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Insubstantial or impractical: "You are talking about some airy fairy concept which will never come in my lifetime” ( Margaret Thatcher).
(adjective)
American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.