foolish — resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.
unintelligence — deficient in intelligence; dull; stupid.
stupidly — lacking ordinary quickness and keenness of mind; dull.
complacently — pleased, especially with oneself or one's merits, advantages, situation, etc., often without awareness of some potential danger or defect; self-satisfied: The voters are too complacent to change the government.
inanely — lacking sense, significance, or ideas; silly: inane questions.
mindlessly — without intelligence; senseless: a mindless creature.