Not flexible; incapable of bending or of being bent; rigid: as, an inflexible rod.Unyielding in temper or purpose; that will not yield to prayers or arguments; firm in purpose; incapable of being turned; not to be prevailed on.Not to be changed or altered; unalterable; not permitting variation.Synonyms Rigid, stiff.Inexorable, inflexible, resolute, steadfast, unbending, unyielding, immovable, unrelenting; obstinate, stubborn, dogged.