I am looking for a verb that describes one's thinking (or judgment) by first impression, or impression without further inquiry. Many thanks
Best thing I can think of for this is intuit:
to know, sense, or understand by intuition
Used something like this:
Johnny intuited that the apple would be delicious from it's perfect appearance. Unfortunately, it tasted like cardboard.
That's to surmise. When one relies only on a cursory impression the evidence is neither strong nor certain, even if the judgment or inference turns out to be correct.
But, as a native speaker, I expect this sense of surmise is likely to be misunderstood. I'd prefer a phrase, such as draw a conclusion offhand.