Unsound
Unsound adjective - Not using or following good reasoning.
Usage example: it is clearly unsound to argue that just because a scientific explanation for that phenomenon does not currently exist, no such explanation is possible
Weak is a synonym for unsound in flimsy topic. In some cases you can use "Weak" instead an adjective "Unsound", when it comes to topics like strong, untenable.
Mutual synonyms
Both words in one sentence
- Ailnoth in The Raven in the Foregate is a competent clerk, but when made a village confessor his Holier Than Thou attitude imperils the flock and drives a parishioner to suicide after he publicly bars her on the (doctrinally unsound) grounds that if the flesh was weak then the spirit was unwilling.
Source: The Peter Principle
Cite this Source
Weak and Unsound. (2016). Retrieved 2026, July 21, from https://thesaurus.plus/related/unsound/weak
Unsound & Weak. N.p., 2016. Web. 21 Jul. 2026. <https://thesaurus.plus/related/unsound/weak>.
Weak or Unsound. 2016. Accessed July 21, 2026. https://thesaurus.plus/related/unsound/weak.
Google Ngram Viewer shows how "unsound" and "weak" have occurred on timeline