untenable

/AH0 N T EH1 N AH0 B AH0 L/
adjective
  1. 1

    Not able to be held, as of an opinion or position; unholdable, indefensible.

    โ€œThe theory of cold fusion was untenable.โ€

  2. 2

    Unfit for habitation

Source: https://en.wiktionary.org/wiki/untenable