The Collaborative International Dictionary of English v.0.48:
head-in-the-clouds \head-in-the-clouds\ adj. unable to concentrate on matters at hand; flighty[2]. Syn: flighty, scatterbrained. [WordNet 1.5]WordNet (r) 3.0 (2006):
head-in-the-clouds adj 1: guided by whim and fancy; "flighty young girls" [syn: flighty, flyaway, head-in-the-clouds, scatterbrained]