to say or write that something is true, correct etc

declare the truth of something

to state or write (something) as a reason or excuse, in support of a claim or in denial of a charge

assert; claim

to justify (something) by using evidence or firm behaviour

insist, declare, maintain

to declare (something) openly

state; profess

to declare that one has (beliefs, likes, ignorance, interests etc)

declare, assert

complain, disapprove; argue against

complain, disapprove; argue against