Hard
Hard adjective - Given to exacting standards of discipline and self-restraint.
Usage example: a hard disciplinarian who is quick to punish the tiniest violation of the rules
Rigid is a synonym for hard in firm topic. In some cases you can use "Rigid" instead an adjective "Hard", when it comes to topics like tough, easy, rocklike. popular alternative
Rigid
Mutual synonyms
Both words in one sentence
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It also places a spin on it in that the fact that a belief is hard to 'kill' is not necessarily a good thing if the belief is not a good one, or if the belief has become an overly rigid dogma.
Source: You Cannot Kill an Idea - Bonesaws penetrate hard, rigid substances like plaster and bone, but not soft substance like flesh.
Source: Strong Flesh, Weak Steel - Later, Miyu can memorize all the steps in a dance, but because she thinks about it so hard, it looks too forced and rigid.
Source: Don't Think, Feel
Cite this Source
Rigid and Hard. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/hard/rigid
Hard & Rigid. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/hard/rigid>.
Rigid or Hard. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/hard/rigid.
Google Ngram Viewer shows how "hard" and "rigid" have occurred on timeline