unattractive

adj.

不吸引人的；丑陋的；无吸引力的；枯燥的

1. The exterior of the building is very unattractive.
   这建筑物的外观很不起眼。
2. I wouldn't say she's ugly, just unattractive.
   我并不是说她长得很丑，只是没有什么魅力而已。
3. It's an unattractive building, ugly even.
   这栋建筑毫不美观，甚至可以说难看。

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Maxims or myths of beauty? A meta-analytic and theoretical review.
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Sexual Selection for Aesthetic Traits in Species with Biparental Care
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The prominent mandibular angle: preoperative management, operative technique, and results in 42 patients.
Are Attractive People Rewarding? Sex Differences in the Neural Substrates of Facial Attractiveness