Invalid
Invalid adjective - Not using or following good reasoning.
Usage example: an argument which has one untrue premise is invalid
Logical
Logical adjective - According to the rules of logic.
Usage example: the lawyer won the case with a logical argument about the motives of the suspect
Both words in one sentence
- However, one must keep in mind that—depending on the surrounding circumstances—a deductively fallacious argument may still, nonetheless, be a reasonable and (inductively) logical argument that has decent prospects of being true despite the deductive logic being invalid.
Source: Logical Fallacies -
Since he's aware of where and when he will commit this murder, the logical thing to do would be to hide himself until such time that the vision is rendered invalid, at worst proving that the Precogs' vision was wrong (or, one could argue, was prevented because he himself chose to prevent it).
Source: Film / Minority Report
Cite this Source
Logical and Invalid. (2016). Retrieved 2026, July 22, from https://thesaurus.plus/related/invalid/logical
Invalid & Logical. N.p., 2016. Web. 22 Jul. 2026. <https://thesaurus.plus/related/invalid/logical>.
Logical or Invalid. 2016. Accessed July 22, 2026. https://thesaurus.plus/related/invalid/logical.
Google Ngram Viewer shows how "invalid" and "logical" have occurred on timeline