crackbrained

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Definitions from WordNet

Adjective crackbrained has 1 sense

crackbrained, idiotic - insanely irresponsible; "an idiotic idea"
Antonym: sane (indirect, via insane)

Definitions from the Web

Term: crackbrained

Definition:

adjective - having or showing a crazy or foolish state of mind; irrational or eccentric

Senses:

Sense 1:

adjective - characterized by eccentricity or irrationality

Example sentence: The crackbrained inventor's latest creation was a machine that turned apples into shoes.

Sense 2:

adjective - wildly imaginative or illogical

Example sentence: His crackbrained scheme to build a spaceship out of cardboard failed spectacularly.