challenging competing contending striving struggling vying battling fighting grappling tussling warring clashing combating combatting conflicting wrestling scuffling scrimmaging brawling scrapping feuding quarrelling quarreling attacking wrangling engaging tangling dueling duelling rassling rowing campaigning tilting encountering shooting bombarding altercating skirmishing confronting assaulting squabbling romping slugging disputing opposing questioning defying querying resisting debating impeaching doubting arguing litigating blasting refuting denying contradicting countering rebutting negating controverting gainsaying disavowing negativing repudiating disproving rejecting disclaiming contravening disowning disallowing confuting impugning debunking discrediting answering crossing quashing invalidating exploding traversing disbelieving disagreeing crushing parrying breaking squelching forswearing retorting responding naysaying withstanding deflecting interrogating grilling probing topping abnegating exposing