1. 硬的;不易弯曲的
    Something that is stiff is firm or does not bend easily.

    e.g. The furniture was stiff, uncomfortable, too delicate, and too neat...
           家具又硬又不舒服，太不结实而且太小巧。
    e.g. His waterproof trousers were brand new and stiff...
           他那条防水裤崭新笔挺。

2. (门、抽屉等)难打开的，不灵活的，发紧的
    Something such as a door or drawer that is stiff does not move as easily as it should.

stiff的翻译

    e.g. Train doors have handles on the inside. They are stiff so that they cannot be opened accidentally.
           火车车门内侧有把手。把手都很紧，防止意外开启。

3. (肌肉或关节)酸痛的，僵硬的
    If you are stiff, your muscles or joints hurt when you move, because of illness or because of too much exercise.

stiff

    e.g. The Mud Bath is particularly recommended for relieving tension and stiff muscles...
           特别推荐想要放松情绪、缓解肌肉酸痛的人泡泥浆浴。
    e.g. I'm stiff all over right now — I hope I can recover for tomorrow's race.
           我现在全身酸痛——希望明天比赛时能恢复过来。

4. (行为)拘谨的，生硬的，不太友好的
    Stiff behaviour is rather formal and not very friendly or relaxed.

    e.g. She looked at him with a stiff smile...
           她看着他，脸上挤出生硬的一笑。
    e.g. They always seemed a little awkward with each other, a bit stiff and formal.
           他们在一起似乎总是觉得有点别扭，有点拘谨，不太随意。

5. 艰难的;严厉的;激烈的
    Stiff can be used to mean difficult or severe.

    e.g. The film faces stiff competition for the Best Film nomination...
           这部电影在角逐最佳影片提名时面临着激烈的竞争。
    e.g. Under Greece's stiff anti-drugs laws they could face twenty years in jail.
           根据希腊严厉的反毒品法律，他们将面临 20 年监禁。

6. (酒)烈性的，酒精度数高的
      A stiff drink is a large amount of a strong alcoholic drink.

      e.g. ...a stiff whisky.
             一杯烈性的威士忌

7. (风)强劲的，猛烈的
      A stiff wind is blowing quite strongly.

      e.g. Next morning dawned clear and sunny, with a stiff breeze rustling the trees.
             次日一大早,天空晴朗无云，大风吹得树木沙沙作响。

8. 十分;极其;完全
      If you are bored stiff, worried stiff, or scared stiff, you are extremely bored, worried, or scared.

      e.g. Anna tried to look interested. Actually, she was bored stiff...
             安娜努力装出感兴趣的样子。实际上，她腻烦透了。
      e.g. I was scared stiff when I realized what I'd done.
             当我意识到自己的所作所为时，我吓坏了。

9. stiff upper lip -> see lip