Synonyms to defeasible

refutable, arguable, at issue, confutable, conjectural, contestable, controversial, controvertible, debatable, deniable, disprovable, disputable, doubtable, doubtful, dubious, dubitable, iffy, in dispute, in doubt, in dubio, in question, mistakable, moot, open to doubt, open to question, problematic, questionable, speculative, suppositional, suspect, suspicious