Invaluable
Invaluable adjective - Having a value beyond any ability to appraise or adequately appreciate.
Key and invaluable are semantically related. in indispensable topic. In some cases you can use "Key" instead an adjective "Invaluable".
Nearby Word: invaluably
Key
Key adjective - Coming before all others in importance.
Invaluable and key are semantically related. Sometimes you can use "Invaluable" instead an adjective "Key".
Both words in one sentence
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This ability makes it invaluable to certain characters throughout the first three Episodes, and since it contains a copy of Xion's consciousness, it can act as the final key to her Core.
- He's also friends with the authors of The Magic of Torchwood and De Aged, crediting the former as a key beta/source of advice and the latter as an invaluable source of scientific expertise.Has shown trope examples of: Ace Pilot: deconstructs this.
Source: Creator / Nimbus Llewelyn
Cite this Source
Key and Invaluable. (2016). Retrieved 2026, August 03, from https://thesaurus.plus/related/invaluable/key
Invaluable & Key. N.p., 2016. Web. 03 Aug. 2026. <https://thesaurus.plus/related/invaluable/key>.
Key or Invaluable. 2016. Accessed August 03, 2026. https://thesaurus.plus/related/invaluable/key.
Google Ngram Viewer shows how "invaluable" and "key" have occurred on timeline