Synonyms of the word

asseverate

• v. To declare earnestly, seriously, or positively; to affirm.

assert

• n. (computer science) an assertion; a section of source code which tests whether an expected condition is…
• v. To declare with assurance or plainly and strongly; to state positively.
• v. To use or exercise and thereby prove the existence of.
• v. To maintain or defend, as a cause or a claim, by words or measures; to vindicate a claim or title to.
• v. (computer science) To make true; to make equal to 1.

insist

• v. (with on or upon or (that + ordinary verb form)) To hold up a claim emphatically.
• v. (sometimes with on or upon or (that + subjunctive)) To demand continually that something happen or be…
• v. (obsolete, chiefly geometry) To stand (on); to rest (upon); to lean (upon).

maintain

• v. (obsolete, transitive) To support (someone), to back up or assist (someone) in an action.
• v. To keep up; to preserve; to uphold (a state, condition etc.).
• v. To declare or affirm (a clause) to be true; to assert.