Rigid

(a.) Firm; stiff; unyielding; not pliant; not flexible.

Rigid - Other Definitions

(a.) Firm; stiff; unyielding; not pliant; not flexible.
(a.) Hence, not lax or indulgent; severe; inflexible; strict; as, a rigid father or master; rigid discipline; rigid criticism; a rigid sentence.
(v.) In a rigid manner; stiffly.