1. Establishing as invalid or untrue
   - disconfirming

1. Declare invalid
   - annul, quash, void, avoid, nullify 
2. Make invalid for use
   - cancel 
3. Show to be invalid
   - nullify 
4. Take away the legal force of or render ineffective
   "invalidate a contract"
   - void, vitiate

See also: invalidation, invalidator, unsupportive

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

Antonym: validate

• territorial
• Territorial Army
• territorial division
• territorial dominion
• territorial reserve
• territorial waters
• territorialisation
• territorialise
• territoriality
• territorialization
• territorialize
• territorially
• territory
• terror
• terror-stricken
• terror-struck
• terrorisation
• terrorise
• terrorism
• terrorist
• terrorist act
• terrorist attack
• terrorist cell
• terrorist group
• terrorist organisation