rigid

Not flexible or pliant; stiff: synonym: stiff.

Not moving or flexing.

Not changing or adjusting to different conditions or problems.

Scrupulously or severely maintained or performed; rigorous or harsh.

Being an airship with a external frame made of rigid parts.

Stiff; not pliant or easily bent; not plastic or easily molded; resisting any change of form when acted upon by force; hard.

Not easily driven back or thrust out of place; unyielding; firm.

Not easily wrought upon or affected; inflexible; hence, harsh; severe; rigorous; rigorously framed or executed: as, a rigid sentence; rigid criticism.

Strict in opinion, conduct, discipline, or observance; uncompromising; scrupulously exact or exacting: as, a rigid disciplinarian; a rigid Calvinist.

Stiff in outline or aspect; harsh; hard; rugged; without smoothness, softness, or delicacy of appearance.