Asseverate is a verb meaning to state something emphatically or ASSERT something strongly. It can be used in many different contexts, and the crossword solutions for this term provide a range of synonyms that can be used in place of asseverate. VOUCH (5 letters) means to give a guarantee or assurance, ASSURE (6 letters) means to make certain or confirm, MAINTAIN (8 letters) means to keep up or support, ASSERT (6 letters) means to state positively or confidently, ALLEGE (6 letters) means to state without proof, PLEDGE (6 letters) means to promise or commit, ATTEST (6 letters) means to certify or bear witness, PROTEST (7 letters) means to express strong objection, AVOW (4 letters) means to DECLARE openly, UTTER (5 letters) means to express or state, AVER (4 letters) means to AFFIRM or ASSERT, VOW (3 letters) means to promise solemnly, DECLARE (7 letters) means to state emphatically, AFFIRM (6 letters) means to ASSERT positively, and SWEAR (5 letters) means to make a solemn promise.