Crucial
Crucial adjective - Of the greatest possible importance.
Irreplaceable and crucial are semantically related. In some cases you can use "Irreplaceable" instead an adjective "Crucial".
Nearby Word: crucially
Irreplaceable
Irreplaceable adjective - Impossible to replace.
Crucial and irreplaceable are semantically related. Sometimes you can use "Crucial" instead an adjective "Irreplaceable".
Mutual synonyms
Both words in one sentence
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This can result in an Unwinnable by Mistake scenario, as the player can get past the point where they can attain a crucial item, or having an irreplaceable NPC simply fail to appear.
Source: Sequence Breaking
Cite this Source
Irreplaceable and Crucial. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/crucial/irreplaceable
Crucial & Irreplaceable. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/crucial/irreplaceable>.
Irreplaceable or Crucial. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/crucial/irreplaceable.
Google Ngram Viewer shows how "crucial" and "irreplaceable" have occurred on timeline