D defs.my
Entry 3 senses Webster, 1913

Inflexible

/ĭnˌ-flĕk'-səb-əl/ · In·flex·i·ble · IPA /ɪnˈflɛksəbl̩/
01 a. Not capable of being bent; stiff; rigid; firm; unyielding.
  1. 1.
    Not capable of being bent; stiff; rigid; firm; unyielding.
  2. 2.
    Firm in will or purpose; not to be turned, changed, or altered; resolute; determined; unyieding; inexorable; stubborn.
    ““Inflexibleas steel.”” — Miltom.
    “A man of upright and inflexible temper . . . can overcome all private fear.” Addison.
  3. 3.
    Incapable of change; unalterable; immutable.
    “The nature of things is inflexible.” I. Watts.