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airy-fairy

adjective
 
/ˌeə.riˈfeə.ri/ US  /ˌer.iˈfer.i/ UK informal

Definition

not practical or not based on the situation as it really is: She's talking about buying an old castle in Ireland. It all sounds a bit airy-fairy to me.Useless and futile
(Definition of airy-fairy adjective from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)

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