hideous

Compared meaning: unattractive to look at (adjective).

比较义项：难看、丑陋（形容词）。

• ugly

  The most general, everyday word for something unpleasant to look at; neutral in strength and register, used for almost anything visually unattractive.

  最普通、最常用的词，泛指“看起来令人不悦”；语气中性，强度适中，几乎可以形容任何视觉上不好看的事物。

  That bright orange couch looks really ugly in such a small room.

  那张亮橙色的沙发放在这么小的房间里显得真难看。

• hideous 本词

  Much stronger than ugly; describes something extremely and shockingly unattractive, often provoking disgust or fear.

  语气比ugly强得多，形容极其丑陋、令人震惊的事物，常带有厌恶或恐惧的感觉。

  The monster's face in the film was so hideous that children covered their eyes.

  电影里那个怪物的脸丑陋可怕极了，吓得孩子们都捂住了眼睛。

• grotesque

  Ugly in a strange, distorted or exaggerated way, often bizarre enough to be shocking or darkly comic, not simply unattractive.

  形容因怪异、扭曲或夸张而显得丑陋，往往怪诞到令人震惊甚至带点黑色幽默的程度，而不只是单纯的不好看。

  The carnival mirror twisted his reflection into a grotesque, bulging shape.

  狂欢节的哈哈镜把他的影像扭曲成一个怪诞、鼓胀的形状。

• unsightly

  A milder, more formal word, often used for something that spoils an otherwise pleasant view, like litter or a blemish, rather than for a person's appearance.

  语气较委婉、较正式的词，常用来形容破坏原本美观景象的东西（如垃圾、污渍），而较少用来形容人的相貌。

  The city removed the unsightly graffiti from the park's walls.

  市政部门清除了公园墙上那些难看的涂鸦。

Ugly, hideous, grotesque, and unsightly all describe something unpleasant to look at. Ugly is the general, neutral word. Hideous is much stronger. Grotesque means ugly in a strange, distorted way. Unsightly is milder, often for something spoiling a view. Grotesque meaning 'absurd' is not compared.

这几个词都可以形容“难看、丑陋”，但程度和语气不同：ugly最常用、最中性；hideous程度强烈，常带厌恶或恐惧；grotesque侧重“怪异到可笑或惊悚”的丑；unsightly较正式，多用于破坏美观的事物而非人的长相。这里不比较grotesque用来形容荒诞、离谱等非视觉意味的用法（如a grotesque waste of money）。