It's "an observation believed to be false". In the situation you describe, it's I doubt he is happy with it. It's, approximately, I don't think that he is happy with it .
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RaenIn Chinese, it's stating the speculation and the speaker believes "she" would sneak out tonight.In that case, your English-Chinese dictionary is wrong about whatever Chinese word they're giving you for the English word "doubt".
Raenthe same translation word for "doubt" and "suspect"Oh, my goodness!!! That's a bad mistake in the dictionary!!! It's time for you to contact the publishers and try to have that corrected in future editions!