stiff

Compared meaning: a body part that will not move (adjective).

比较义项：身体部位僵硬、活动不便或完全不能动（形容词）。

• stiff 本词

  Describes a body part that feels tight and resists bending, often with mild discomfort, but it can usually still be moved with effort; the condition is typically minor and temporary.

  stiff 表示身体部位感觉紧绷、不易弯曲，常伴有轻微不适，但通常仍可费力活动；这种状态往往较轻微且是暂时的。

  My neck feels stiff after sleeping in a strange position.

  我以奇怪的姿势睡觉后，脖子感觉很僵硬。

• immobile

  Describes a body part that cannot move at all, usually because of injury, paralysis, or being fixed in place; it means a complete, often longer-lasting loss of movement.

  immobile 表示身体部位完全无法移动，通常是由于受伤、瘫痪或被固定住；描述的是完全的、往往持续较久的丧失活动能力。

  After the accident, his injured leg remained immobile, unable to move even an inch.

  事故发生后，他受伤的腿完全不能动，连一点都动不了。

Stiff and immobile both describe a body part that does not move well. Stiff means tight and hard to bend, but it can usually still move. Immobile means completely unable to move, often from injury or paralysis. This does not cover stiff meaning 'strict'.

这两个词都能形容身体部位无法正常活动，但程度不同：stiff 指活动受限、僵硬不适，通常仍能勉强活动；immobile 指完全不能移动。这里不比较 stiff 表示“严厉、难对付”（如 stiff penalty）或“生硬拘谨”的其他用法。