Undisguised describes a feeling that shows plainly on someone, with no attempt to cover it. It goes in front of a small family of nouns — nearly always emotions, and nearly always ones people usually hide: undisguised contempt, undisguised delight, undisguised glee, undisguised hostility, undisguised curiosity, undisguised relief. "She looked at him with undisguised contempt" tells you two things at once: she felt contempt, and she did not care that he could see it. That second half is where the word earns its keep. Politeness normally makes us mask strong feeling, so calling it undisguised says a mask was expected and was not worn — which makes it either bracingly honest or shockingly rude, depending on the feeling. Note the small joke in the word: a disguise is something you put on, but nobody says "she disguised her contempt" as often as they say "undisguised contempt". The negative form is far commoner than the positive one. It is a written word, at home in novels and journalism; in speech people say "you could see it all over her face". There is a rarer literal use too — an undisguised face, an undisguised soldier, someone not wearing a disguise — but you will meet the feeling sense ninety-nine times out of a hundred.

毫不掩飾的、明擺在臉上的（後面幾乎都接情緒：毫不掩飾的輕蔑／喜悅／好奇）