in·flex·i·ble 
(ĭn-flĕksə-bəl)
(ĭn-flĕksə-bəl)adj.
1. Not easily bent; stiff or rigid. See stiff.
2. Incapable of being changed; unalterable: an inflexible rule.
3. Refusing to change one's attitude, purpose, or principles; immovable: an inflexible disciplinarian.
in·flex′i·bili·ty, in·flexi·ble·ness n.
in·flexi·bly adv.