One word is "Annul."
Lawyers will try to invalidate the contract.
cancel
invalidate is the only one i can think of try for the other one.
Other words for cancel may be void, revoke, annul, eradicate, eliminate, counteract, offset, cross off, perforate, invalidate, close, offset...
The certificates was invalidated by the superiors
The world invalidate means not valid or to make invalid. Other such definitions include: to nullify something. One can use it in an example as follows: The court found enough evidence to invalidate the contract.
No, touching a dog does not invalidate your wudu (ritual ablution) in Islam.
Words meaning to cancel or make ineffective are void, revoke, annul, counteract, offset, invalidate...
The lottery ticket proved to be invalid when he attempted to collect the prize.
No, they can render an opinion as to it beng unconstitutional but they have no power to invalidate the law. They must forward it to the Supreme Court for their review and judgement. Only the Supreme Court can nullify the law and invalidate an Act of Congress.
cancel
There are lots of different words for neutralise. The ones for the meaning: counteract are:abrogate, annul, balance, cancel, compensate for, conquer, counterbalance, countercheck, counterpoise, countervail, defeat, frustrate, invalidate, negate, nullify, offset, overcome, override, overrule, redress, subdue and undo.