Capable of being disputed; disputable; not too evident to exclude difference of opinion: as, a controvertible point of law.

adjective. Capable of being controverted; disputable; admitting of question.

adjective. Open to questioning; that which can be denied, challenged, or disputed.

"By presuming that only my beliefs, practices, and perceptions are correct and unassailable implies that all others ipso facto are incorrect and controvertible."

incontrovertible  

controversy  controvert  

amodal  circumstances  contestable  debatable  disputable  

disputable  questionable