In-flĕx'i-ble, a.

a. [Prefix in, not, and flexible; Fr. & Sp. inflexible, It. infessibile, Lat. inflexibilis.]

1. Not capable of being bent; firm; unyielding.
2. Firm in purpose; not to be turned; not to be changed or altered. “Inflexible as steel.” Milton.

A man of upright and inflexible temper . . . can overcome all private fear. Addison. 3. Incapable of change; unalterable. The nature of things is inflexible. Watts. Syn. — Unbending; unyielding; rigid; inexorable; pertinacious; obstinate; stubborn; unrelenting.