**Conjecture** — to express an opinion or idea on the basis of incomplete evidence or without proof.
Here are some examples of using the word «conjecture»:
1. It is just a conjecture, but I think the company's success is due to its innovative approach to marketing.
2. The police are reluctant to speculate or conjecture about the suspect's motives without more evidence.
3. Scientists have long conjectured about the existence of dark matter, but it remains an unproven theory.
4. The judge warned the jury not to base their decision on conjecture and to rely only on the evidence presented in court.
5. The book's ending was so ambiguous that readers were left to conjecture about the characters' fates.
6. The astrologer's predictions were nothing more than conjecture and had no basis in scientific fact.
7. The archaeologist was careful not to conjecture about the age of the artifact until he had more evidence to support his hypothesis.
8. The journalist's article was based on conjecture and unverified information, which led to accusations of sensationalism.
9. The psychologist's theory was based on conjecture and lacked empirical evidence, which led to criticism from other experts.
10. The witness's testimony was unreliable and based on conjecture, which undermined the credibility of the prosecution's case.