Valid
Valid adjective - According to the rules of logic.
Usage example: your argument isn't valid because you're taking what should be the conclusion and using it as a premise
Nearby Words: validity, validation
Weak
Weak adjective - Not using or following good reasoning.
Usage example: your argument is weak
Both words in one sentence
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The process by which, in a few hours, a weak page can be turned into a valid entry with enough examples to satisfy those who petitioned for its deletion.
Source: Wiki Magic -
On the other hand, throwing firebombs like a maniac is a valid way to fight your way through this Nintendo Hard game, especially if you're too weak to melee and doesn't have a spell to sling.
Source: Throw Down the Bomblet - Bane acknowledges that waiting for an enemy to grow weak is a valid and normally wise strategy, but this was a special case because it was essential for Zannah to be stronger than him once she became the Sith Lord, otherwise the Sith Order would stagnate.
Source: I Can Rule Alone
Cite this Source
Weak and Valid. (2016). Retrieved 2026, August 14, from https://thesaurus.plus/related/valid/weak
Valid & Weak. N.p., 2016. Web. 14 Aug. 2026. <https://thesaurus.plus/related/valid/weak>.
Weak or Valid. 2016. Accessed August 14, 2026. https://thesaurus.plus/related/valid/weak.
Google Ngram Viewer shows how "valid" and "weak" have occurred on timeline