Synonyms of the word 
DENIABLE → CONFUTABLE - CONFUTATIVE - DISAVOWABLE - QUESTIONABLE - REFUTABLE
deniable
- adj. Able to be denied or contradicted.
confutable
- adj. (archaic or formal) That can be confuted, i.e. shown to be false; disprovable.
confutative
- adj. That confutes.
disavowable
- adj. Capable of being disavowed.
questionable
- adj. (obsolete) Inviting questions; inviting inquiry.
- adj. Problematic; open to doubt or challenge.
- adj. Of dubious respectability or morality.
refutable
- adj. Able to be refuted, or shown to be false.
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