from Wiktionary, Creative Commons Attribution/Share-Alike License
- adj. Open to questioning; that which can be denied, challenged, or disputed.
from the GNU version of the Collaborative International Dictionary of English
- adj. Capable of being controverted; disputable; admitting of question.
from The Century Dictionary and Cyclopedia
- Capable of being disputed; disputable; not too evident to exclude difference of opinion: as, a controvertible point of law.
controvert + -ible (Wiktionary)