impugner
One who disputes
One who impugns—who attacks, challenges, or calls into question the truth, validity, or integrity of something.
An impugner of motives suggests ulterior purposes behind someone's actions.
The impugner of the witness's testimony was himself later discredited.
The word is formal and relatively uncommon.
One competing against incumbent
- attackerOne who strikes first
- assailantOne who attacks another
- criticOne who judges merit
- detractorOne who diminishes
accuser · denouncer · disparager · defamer · slanderer · vilifier · maligner · traducer
One who challenges
- disputerOne who challenges claims
- opposerOne who resists
- objectorOne who formally disagrees
- protesterOne who publicly opposes
dissenter · refuter · rebuttal · counterargument · contradiction · denial · negation · repudiation
One who disbelieves
- questionerOne who poses inquiries
- skepticOne who doubts claims
- disbelieverOne who denies truth
- cynicDoubter of good intentions
naysayer · debunker · denier · contrarian · iconoclast · dissident · heretic · nonbeliever
Moral soundness and consistency
- honestyTruthfulness, sincerity
- veracityConformity to fact
- truthfulnessHabit of not lying
- reliabilityConsistent, predictable performance
trustworthiness · authenticity · legitimacy · validity · reputation · character · honor · probity
challenger
One competing against incumbent
detractor · accuser · denouncer · disparager · defamer · slanderer · vilifier · maligner · traducer · calumniator
contester
One who challenges
protester · dissenter · refuter · rebuttal · counterargument · contradiction · denial · negation · repudiation · disavowal
doubter
One who disbelieves
- questionerOne who poses inquiries
- skepticOne who doubts claims
- disbelieverOne who denies truth
cynic · naysayer · debunker · denier · contrarian · iconoclast · dissident · heretic · nonbeliever · agnostic
integrity
Moral soundness and consistency
- honestyTruthfulness, sincerity
- veracityConformity to fact
- truthfulnessHabit of not lying
reliability · trustworthiness · authenticity · legitimacy · validity · reputation · character · honor · probity · sincerity
impugnersupporter
One who backs another
defender · advocate · vindicator · upholder · endorser
impugn, impugning, impugned, impugns, impugnable, impugnment