cozy

Compared meaning: physically comfortable and relaxed (adjective).

比较义项：身体上感到舒适、放松（形容词）。

• comfortable

  The most general and common word; describes anything (furniture, clothes, temperature, situations) that causes no physical discomfort, without implying warmth or a small space.

  最通用常见的词；可以形容任何不让人身体不适的事物（家具、衣物、温度、场合），不一定带有温暖或空间小的含义。

  The new mattress is so comfortable that I fall asleep in minutes.

  这张新床垫非常舒服，我几分钟就能睡着。

• easy

  In this sense it appears mainly in fixed expressions like 'easy chair' or 'feel easy', meaning relaxed and free of tension; used freely it sounds old-fashioned or literary.

  在这个意义上主要出现在“easy chair”（安乐椅）或“feel easy”（感到轻松自在）等固定搭配中，表示放松、没有紧张感；如果自由使用会显得老式或书面化。

  Grandpa dozed off in his easy chair by the fireplace.

  爷爷在壁炉旁的安乐椅上打起了盹。

• cozy 本词

  Suggests warmth plus a small, enclosed, homely space that feels pleasant and safe, often used for rooms, blankets, or gatherings.

  强调温暖，并带有空间小、封闭、家一般惬意安全的感觉，常用来形容房间、毯子或聚会等。

  The candlelit room felt cozy on the cold winter night.

  在寒冷的冬夜里，烛光下的房间显得温馨舒适。

• snug

  Emphasizes being closely sheltered and warm, as if wrapped or tucked in against cold or danger; often used for small spaces or being under covers.

  强调被严实地包裹、遮蔽而感到温暖，仿佛紧紧地被围住以抵御寒冷或危险；常用于形容狭小空间或裹在被子里的状态。

  The children were snug in their beds while the storm raged outside.

  暴风雨在外面肆虐，孩子们裹着被子舒适安稳地躺在床上。

All four describe physical comfort. Comfortable is the most general term. Easy appears in fixed phrases like 'easy chair'. Cozy suggests warmth in a small space. Snug means wrapped and warm. Not covered: easy as 'not difficult', comfortable as 'financially secure', snug as 'tight clothes'.

这几个词都可以形容让人感到身体舒适、放松的状态，但语气强弱和使用场合不同：comfortable最通用，cozy和snug偏重温暖、私密的空间感，easy在这个意义上较书面、多见于固定搭配。这里不比较easy的“不难”义、comfortable的“经济宽裕”义，以及snug表示衣物“紧身合适”的用法。