featherbrained vs giddy

featherbrained and giddy both are adjectives.

Word	Noun	Adjective	Verb	Adverb
featherbrained	No	Yes	No	No
giddy	No	Yes	No	No

As adjectives, featherbrained and giddy are synonyms defined as:

Other synonyms of featherbrained include airheaded, dizzy, empty-headed, light-headed, lightheaded, silly.

featherbrained (adjective)	giddy (adjective)
lacking seriousness; given to frivolity	lacking seriousness; given to frivolity
	having or causing a whirling sensation; liable to falling