rigid Synonyms

stiff strict inflexible stern severe fixed set unyielding uncompromising unbending immovable tight unrelenting hard firm rigorous inelastic austere tense tough tighter stubborn sustained taut tyrannical wooden virgate victorian upright unwarped unswayable unshakable unmovable unlimber unflexible wrongheaded strong starchy starched stagnant stable spartan sound solid situated single-minded settled sessile serious stark