All logical antonyms

adj logical

• unrealistic — interested in, concerned with, or based on what is real or practical: a realistic estimate of costs; a realistic planner.
• unwise — not wise; foolish; imprudent; lacking in good sense or judgment: an unwise choice; an unwise man.
• unsuitable — not suitable; inappropriate; unfitting; unbecoming.
• optional — left to one's choice; not required or mandatory: Formal dress is optional.
• implausible — not plausible; not having the appearance of truth or credibility: an implausible alibi.
• improbable — not probable; unlikely to be true or to happen: Rain is improbable tonight.
• unlikely — not likely to be or occur; improbable; marked by doubt.
• irrational — without the faculty of reason; deprived of reason.
• unsound — not sound; unhealthy, diseased, or disordered, as the body or mind.
• unclear — free from darkness, obscurity, or cloudiness; light: a clear day.
• vague — not clearly or explicitly stated or expressed: vague promises.
• foolish — resulting from or showing a lack of sense; ill-considered; unwise: a foolish action, a foolish speech.
• stupid — lacking ordinary quickness and keenness of mind; dull.
• unintelligent — deficient in intelligence; dull; stupid.
• illogical — not logical; contrary to or disregardful of the rules of logic; unreasoning: an illogical reply.
• unreasonable — not reasonable or rational; acting at variance with or contrary to reason; not guided by reason or sound judgment; irrational: an unreasonable person.
• invalid — an infirm or sickly person.
• obscure — (of meaning) not clear or plain; ambiguous, vague, or uncertain: an obscure sentence in the contract.