scatterbrained vs head-in-the-clouds

scatterbrained and head-in-the-clouds both are adjectives.

Word	Noun	Adjective	Verb	Adverb
scatterbrained	No	Yes	No	No
head-in-the-clouds	No	Yes	No	No

As adjectives, scatterbrained and head-in-the-clouds are synonyms defined as:

Other synonyms of scatterbrained include flighty, flyaway.

scatterbrained (adjective)	head-in-the-clouds (adjective)
lacking sense or discretion	guided by whim and fancy
guided by whim and fancy