If you describe someone’s ideas as airy-fairy , you are critical of them because you think the ideas are vague, impractical, and unrealistic. ( BRIT )
...their airy-fairy principles.
ADJ [ disapproval ]
AIRY-FAIRY
Meaning of AIRY-FAIRY in English
Collins COBUILD Advanced Learner's English Dictionary. Английский словарь Коллинз COBUILD для изучающих язык на продвинутом уровне. 2006