All valid antonyms

adj valid

• 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.
• unreliable — not reliable; not to be relied or depended on.
• fake — to lay (a rope) in a coil or series of long loops so as to allow to run freely without fouling or kinking (often followed by down).
• unreal — not real or actual.
• untrustworthy — deserving of trust or confidence; dependable; reliable: The treasurer was not entirely trustworthy.
• counterfeit — Counterfeit money, goods, or documents are not genuine, but have been made to look exactly like genuine ones in order to deceive people.
• illegal — forbidden by law or statute.
• illegitimate — born of parents who are not married to each other; born out of wedlock: an illegitimate child.
• illicit — not legally permitted or authorized; unlicensed; unlawful.
• unlawful — not lawful; contrary to law; illegal.
• unacceptable — capable or worthy of being accepted.
• unsound — not sound; unhealthy, diseased, or disordered, as the body or mind.
• false — not true or correct; erroneous: a false statement.
• wrong — not in accordance with what is morally right or good: a wrong deed.
• invalid — an infirm or sickly person.