1) Challenge 2) Contend 3) Contest 4) Contradict 5) Deny 6) Dispute 7) Exclusively Saxon word 8) Exclusively Anglo word 9) Repugn 10) Take exception to 11) To deny to oppose 12) Word of purely Anglo origin 13) Word with Anglo-Saxon origins Found on https://www.crosswordclues.com/clue/gainsay
Gain`say' transitive verb [ imperfect & past participle Gainsaid (? or ?); present participle & verbal noun Gainsaying .] [ Middle English geinseien , ageinseien . See Again , and Say to utter.] To contradict... Found on http://www.encyclo.co.uk/webster/G/3