speculate
verb/iʃ.pɨ.kuˈlaɾ/medium
es·pe·cu·lar
Definition
To form a theory or conjecture about a subject without firm evidence.
Economists speculate about the future of interest rates.
It's too early to speculate on the cause of the accident.
Etymology
Do latim 'specularis' (relativo a espelho), de 'speculum' (espelho).