foolish — resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.
honest — honorable in principles, intentions, and actions; upright and fair: an honest person.
idiotic — of, relating to, or characteristic of an idiot.
ignorant — lacking in knowledge or training; unlearned: an ignorant man.
inept — without skill or aptitude for a particular task or assignment; maladroit: He is inept at mechanical tasks. She is inept at dealing with people.
obtuse — not quick or alert in perception, feeling, or intellect; not sensitive or observant; dull.
senseless — destitute or deprived of sensation; unconscious.
slow — moving or proceeding with little or less than usual speed or velocity: a slow train.
stupid — lacking ordinary quickness and keenness of mind; dull.
unclever — mentally bright; having sharp or quick intelligence; able.
unintelligent — deficient in intelligence; dull; stupid.
unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
stylish — characterized by or conforming to style or the fashionable standard; fashionably elegant; smart or chic: She wore a very stylish gown to the inaugural ball.
unwise — not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.
frivolous — characterized by lack of seriousness or sense: frivolous conduct.
naive — having or showing unaffected simplicity of nature or absence of artificiality; unsophisticated; ingenuous.
unthinking — thoughtless; heedless; inconsiderate: an unthinking, tactless person.
calm — A calm person does not show or feel any worry, anger, or excitement.
