utterly

Compared meaning: completely, totally (degree adverb).

比较义项：完全地，彻底地（程度副词）。

• dead

  "Dead" is a casual intensifier placed directly before an adjective or past participle only (as in "dead tired" or "dead certain") — it never modifies a verb, and sounds informal, mainly British.

  “dead”是口语化的程度副词，只能直接放在形容词或过去分词前（相当于“很疲惫”“很确定”这类说法），从不修饰动词，语气随意，主要见于英式英语。

  After the night shift, I was dead tired and fell asleep on the sofa.

  上完夜班后，我累得要命，倒在沙发上就睡着了。

• absolutely

  "Absolutely" is neutral in tone and typically modifies verbs that express opinion or feeling (as in "absolutely love") or extreme, ungradable adjectives, rather than ordinary gradable ones like "tired."

  “absolutely”语气中性，通常修饰表达观点或情感的动词（相当于“非常喜欢”这类说法），或修饰极端的、不可分级的形容词，而不是像“tired”这样的普通可分级形容词。

  I absolutely love the smell of fresh coffee in the morning.

  我早上真的非常喜欢新鲜咖啡的香味。

• perfectly

  "Perfectly" means "completely, without any flaw," and is mainly used to describe how smoothly something goes or how adequate or normal a state is (as in "perfectly fine" or "worked out perfectly").

  “perfectly”意为“完全没有瑕疵”，主要用来描述事情进行得有多顺利，或某种状态是否正常、足够（相当于“完全没问题”“进行得完美无缺”这类说法）。

  The recipe worked out perfectly, and the cake rose exactly as it should.

  这个食谱做得完美无缺，蛋糕正好按预期发起来了。

• utterly 本词

  "Utterly" is a stronger, more formal intensifier used almost only before negative or extreme adjectives (as in "utterly exhausted" or "utterly ridiculous"), emphasizing an extreme, usually undesirable state.

  “utterly”语气更强、更正式，几乎只用在消极或极端的形容词前（相当于“彻底精疲力尽”“荒谬至极”这类说法），强调一种极端、通常不好的状态。

  She was utterly exhausted after the long hiking trip.

  长途徒步之后，她彻底精疲力尽了。

All four mean completely. Dead is casual, before an adjective ('dead tired'). Absolutely is neutral, before verbs or adjectives. Perfectly means without flaw, for normal states. Utterly is stronger, before negative adjectives. Dead can mean 'not alive', and absolutely can mean 'yes'; not compared here.

这四个词在此都表示“完全、彻底”，但语气和用法不同：dead最随意，只能直接修饰形容词或分词；absolutely语气中性，常修饰动词或极端形容词；perfectly强调“毫无瑕疵”，多用于描述顺利、正常的状态；utterly语气更强、偏正式，几乎只用在消极或极端的形容词前。这里不比较dead作形容词表示“死的”的用法，也不比较absolutely单独使用表示“当然、没错”的用法。