1. Establishing as invalid or untrue
   "The new evidence was invalidating to the defendant's alibi";
   - disconfirming, confutative [rare]

1. Declare invalid
   "The court invalidated the contract";
   - annul, quash, void, avoid, nullify
    
2. Take away the legal force of or render ineffective
   "invalidate a contract";
   - void, vitiate
    
3. Make invalid for use
   "invalidate cheques or tickets";
   - cancel

See also: unsupportive

Type of: alter, cancel, change, contradict, mark, modify, negate, score, strike down

Antonym: validate