suppose that something is true without having evidence to confirm it
猜想;臆测
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he surmised that something must be wrong 他猜想肯定有什么地方出了差错
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[with direct speech]‘
I don't think they're locals,’ she surmised .“我想他们不是本地人,”她推测说。
 
a supposition that something may be true, even though there is no evidence to confirm it
猜想;推测
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Charles was glad to have his surmise confirmed 查尔斯很高兴他的推测得到了证实
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[mass noun]
all these observations remain surmise .所有这些评论都仍然只是猜想。
 
"late Middle English (in the senses ‘formal allegation' and ‘allege formally'):  from Anglo-Norman French and Old French