1. 否定,反驳,争论：controversy 争论,辩论 | controvert 否定,反驳,争论 | counter 反对,对抗

2. 否认,反驳：controversy 争论,辨论 | controvert 否认,反驳 | conversant 娴熟,熟识的

3. 议论：controversy 辩论 | controvert 议论 | controvertible 可争论的

4. controvert的解释

4. 争论：controversy 争论 | controvert 争论 | convalesce 康复

1. prove to be false or incorrect

    Synonym: refuterebut

2. be resistant to

    e.g. The board opposed his motion

    Synonym: opposecontradict