Stiff; not pliant; not easily bent. It is applied to bodies or substances that are naturally soft or flexible, but not fluid. We never say, a rigid stone or rigid iron, nor do we say, rigid ice; but we say, an animal body or limb, when cold, is rigid. Rigid is then opposed to flexible, but expresses less than inflexible.

Strict in opinion, practice or discipline; severe in temper; opposed to lax or indulgent; as a rigid father or master; a rigid officer.

Strict; exact; as a rigid law or rule; rigid discipline; rigid criticism.

Severely just; as a rigid sentence or judgment.

Exactly according to the sentence or law; as rigid execution.