1) An unwise man 2) Apt to turn out badly 3) Foolhardy 4) Foolish 5) Hardly well-considered 6) Ill-advised 7) Ill-considered 8) Ill-judged 9) Imprudent 10) Imprudently 11) Inappropriate 12) Injudicious 13) Lacking judgment 14) Lacking prudence 15) Misguided 16) None too savvy 17) Not sage at all 18) Not sensible, foolish 1) Foolish 2) Harebrained 3) Ill-considered 4) Ill-judged 5) Impolitic 6) Inadvisable 7) Injudicious 8) Mistaken 9) Reckless 10) Stupid 
• (a.) Not wise; defective in wisdom; injudicious; indiscreet; foolish; as, an unwise man; unwise kings; unwise measures.
[adj] - showing or resulting from lack of judgment or wisdom
adjective showing or resulting from lack of judgment or wisdom; `an unwise investor is soon impoverished`
not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.