- resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.
- lacking forethought or caution.
- trifling, insignificant, or paltry.
- unwise; silly
- resulting from folly or stupidity
- ridiculous or absurd; not worthy of consideration
- weak-minded; simple
- an archaic word for insignificant
adj.early 14c., from fool (n.) + -ish. Related: Foolishly; foolishness. Old English words for this were dysig, stunt, dol. see penny wise and pound foolish.