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feel weightless
weightless 作表语时常与 feel、become 等系动词连用。
Astronauts feel weightless when orbiting Earth.
宇航员在绕地球飞行时会感到失重。
失重的；无重量的
先理解核心含义，再看它在真实句子里的用法。
失重的；无重量的
having little or no weight or apparent gravitational pull; light
Astronauts feel weightless when orbiting Earth.
宇航员在绕地球飞行时会感到失重。
无重量的。
Without weight.
不受重力影响的；失重的。
Not affected by gravity.
In space, astronauts feel weightless because there is almost no gravity.
在太空中，宇航员几乎感觉不到重力，所以会感到失重。
The new material is so light that it seems almost weightless.
这种新材料非常轻，几乎像是没有重量。
She watched the balloon drift upward, looking weightless in the bright sky.
她看着气球向上飘去，在明亮的天空中显得毫无重量。
weightless 作表语时常与 feel、become 等系动词连用。
Astronauts feel weightless when orbiting Earth.
宇航员在绕地球飞行时会感到失重。
weightless 可作定语修饰 environment、state 等名词。
Scientists study how liquids behave in a weightless environment.
科学家研究液体在失重环境中的表现。
The spacecraft becomes weightless once it reaches orbit.
航天器一旦进入轨道就会变得失重。
Not this
In space, gravity makes astronauts to be weightless.
Use this
In space, gravity makes astronauts weightless.
make 作使役动词时，宾语后直接接形容词作宾补，不能加不定式 to be；所以要去掉 to be，用 weightless 直接说明 astronauts 的状态。
Not this
Astronauts experience weightless in space.
Use this
Astronauts experience a weightless state in space.
experience 是及物动词，后面需接名词或名词短语作宾语；weightless 是形容词，不能单独作宾语，应改用名词 weightlessness，或用名词短语 a weightless state。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
失重环境
Astronauts train for months before working in a weightless environment.
宇航员在失重环境下工作前要训练数月。
感觉失重
When the plane dives, you feel weightless for a few seconds.
飞机俯冲时，你会感觉失重几秒钟。
失重状态
The experiment was carried out in a weightless state.
该实验是在失重状态下进行的。
变得失重
Objects become weightless once they enter orbit.
物体一旦进入轨道就会变得失重。
失重条件
Plants grow differently under weightless conditions.
在失重条件下，植物的生长方式不同。
失重的感觉
Roller coasters can give you a brief weightless sensation.
过山车会给你带来短暂的失重感。
出自美国流行朋克乐队 All Time Low 的歌曲《Weightless》（2009），这句歌词表达摆脱束缚、失重般的自由感。
After the roller coaster dropped, I felt briefly weightless.
过山车俯冲之后，我短暂地感觉到失重。
英国乐队 Marconi Union 的纯音乐《Weightless》，因科学研究称其可有效放松身心而闻名，被誉爲“世界上最放松的歌曲”。
Many people listen to 'Weightless' to help them fall asleep, as it creates a weightless, dreamy atmosphere.
许多人会听《Weightless》来帮助入睡，因为它营造出一种失重、梦幻的氛围。
Use weightless naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
把 weight（重量）和 less（无）连起来：重量没了，像宇航员一样飘起来，就是失重。
语域：neutral 常见场景：航天或物理语境、日常物体描述 该词通常用于科技、航天等中性或正式语境，指失重或无重量；日常描述物体很轻时也自然。表示‘不重要’的用法较少见，多见于正式或书面表达。
None of these words rhymes exactly with 'weightless'. The '-less' words (worthless, restless, tasteless, useless) share the unstressed suffix /ləs/ but have different stressed vowels. 'freight' and 'eight' match the 'eigh' spelling and /eɪ/ sound of the first syllable of 'weightless', but they do not rhyme with the whole word. Beware 'tasteless': despite its similar spelling, it has /stləs/ rather than /tləs/ and does not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.