Stiff, rather than flexible.
Fixed, rather than moving.
Uncompromising.
Rigorous and unbending.
An airship whose shape is maintained solely by an internal and/or external rigid structural framework, without using internal gas pressure to stiffen the vehicle (the lifting gas is at atmospheric pressure); typically also equipped with multiple redundant gasbags, unlike other types of airship.
A bicycle with no suspension system.
Pertaining to the metallurgical process for finishing metals.
Pertaining to the well-tempered scale, where the twelve notes per octave of the standard keyboard are tuned in such a way that it is possible to play music in any major or minor key and it will not sound perceptibly out of tune.
Pertaining to the industrial process for toughening glass, or to such toughened glass.
Having a specified disposition or temper.
Moderated or balanced by other considerations.