Invalid
Invalid adjective - Not being in agreement with what is true.
Usage example: that's an invalid assumption on your part
True
True adjective - Following an original exactly.
Usage example: it's not a true reproduction of the painting because the original is much larger
Both words in one sentence
- The premises and conclusion can be "true" or "false"; the chain of reasoning itself can be "valid" or "invalid"; the argument as a whole is either "sound" or "unsound".
Source: Sound, Valid, True - Shout-Out: The override to make Shalmaneser accept invalid data is to say "I say it three times, it must be true".
Source: Literature / Stand on Zanzibar - It's invalid: even if both premises are true, the only thing we know for certain is that Brahim is Moroccan.note And male — from his name: "Brahim" being the Moroccan pronunciation of "Ibrahim", the Arabic equivalent of "Abraham"— but let's ignore that.
Source: Sound, Valid, True
Cite this Source
True and Invalid. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/invalid/true
Invalid & True. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/invalid/true>.
True or Invalid. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/invalid/true.
Google Ngram Viewer shows how "invalid" and "true" have occurred on timeline