[in.de.fea.si.ble] adj (1548): not capable of being annulled or voided or undone "an ~ right" -- in.de.fea.si.bil.i.ty n -- in.de.fea.si.bly adv
INDEFEASIBLE
Meaning of INDEFEASIBLE in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012