Green’s Dictionary of Slang

fuzz-brained adj.

(US) stupid.

1969		in DARE.
1985		(con. 1968) D.A. Dye Citadel (1989) 288: Most of ’em is fuzzy-assed boots, but I expect they’ll do alright if we keep close tabs on ’em.
2002		R. Wright ‘Friends as Flak Jackets’ in Slate 14 Feb. 🌐 You can almost feel his contempt for us fuzz-brained multilateralists, with our indifference to naked national interest, our deep sensitivity to the needs of allies.