slightly

Compared meaning: to a small degree, a little (adverb).

比较义项：稍微、轻微地（adv.）。

• somewhat

  More formal and often written in tone; typically precedes a comparative or evaluative adjective (somewhat surprising, somewhat different) rather than a verb or a plain measurement.

  语气更正式、更偏书面语；通常用在比较级或带有评价色彩的形容词前面（如somewhat surprising、somewhat different），不太用来修饰动词或单纯的度量。

  The weather today is somewhat colder than yesterday morning.

  今天的天气比昨天早上稍微冷一点。

• slightly 本词

  More casual and common in everyday speech; often modifies measurable degree words like temperature, taste or amount, frequently pairs with 'too' (slightly too salty), and can directly modify verbs (slightly increased).

  更口语化，日常使用更常见；常修饰可测量的程度词（如温度、味道、数量），常与“too”搭配（如slightly too salty），也可以直接修饰动词（如slightly increased）。

  The soup tasted slightly too salty for my liking.

  这汤对我来说尝起来稍微有点太咸了。

Somewhat and slightly both weaken the word that follows, meaning a little. Somewhat is more formal, often before a comparative adjective. Slightly is more casual, often used with measurable things like temperature, and pairs with too, as in slightly too salty.

这两个词在“稍微、轻微”这个意义上非常接近，都用来削弱后面形容词或动词的程度，但语气和搭配习惯不同：somewhat更正式、偏书面语，常放在比较级或带评价色彩的形容词前；slightly更口语化，常与“too”连用表示轻微超出某个标准，也能直接修饰动词。