1
leave sth unattended
unattended 在 leave 后作宾语补足语，表示让某物处于无人看管的状态。
Never leave your luggage unattended in a public place.
切勿在公共场所让行李无人看管。
无人看管的；无人照看的
先理解核心含义，再看它在真实句子里的用法。
无人看管的；无人照看的
not watched
Never leave your luggage unattended in a public place.
切勿在公共场所让行李无人看管。
无人看管的；无人在场的
Not attended; without persons present.
未受注意的；未被照料的
Not attended to; not receiving attention.
Please do not leave your luggage unattended in the airport.
请不要让行李在机场无人看管。
The car sat unattended in the parking lot for two days.
那辆车在停车场无人看管地停了两天。
An unattended bike stood outside the shop all afternoon.
一辆无人看管的自行车在商店外停了一下午。
unattended 在 leave 后作宾语补足语，表示让某物处于无人看管的状态。
Never leave your luggage unattended in a public place.
切勿在公共场所让行李无人看管。
unattended 作定语时放在名词前，如 unattended bag / luggage。
Unattended bags will be removed by security.
无人看管的行李将被安保人员移走。
be unattended 作表语，表示处于无人照看或值守的状态。
Small children should never be unattended near a pool.
小孩子在游泳池附近时绝不能无人看管。
Not this
He unattended the meeting because he was sick.
Use this
He did not attend the meeting because he was sick.
unattended 是形容词，意为“无人看管的/无人陪伴的”，不能用作动词；表示“没有出席”要用动词 attend 的否定式 did not attend。
Not this
She was unattended in class, so she didn't hear the homework.
Use this
She was inattentive in class, so she didn't hear the homework.
unattended 表示“无人照看/无人陪伴”，而“上课不专心”应该用 inattentive。两者形近但意思不同，这里要表达的是“不专心”，所以用 inattentive。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
让某物无人看管
Never leave your luggage unattended in the airport.
切勿将行李遗留在机场无人看管。
无人看管的行李
Unattended baggage will be removed by security.
无人看管的行李将被保安人员移走。
无人看管的车辆
An unattended vehicle may be towed.
无人看管的车辆可能会被拖走。
无人照看的孩子
Unattended children are not allowed in the pool area.
泳池区域不允许无人照看的孩子进入。
无人看管的篝火
Unattended campfires are a leading cause of forest fires.
无人看管的篝火是森林火灾的主要原因。
Use unattended naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
un-（不）+ attended（被照料）→ 没人照料。想象行李箱被留在无人看管的角落。
语域：neutral 常见场景：公共通知、警示标识、正式书面描述 unattended 通常用于中性偏正式的语境，多出现在公共通知、警示标识或正式书面描述中（如无人看管的行李、物品）；在表示“无人陪伴”时也多见于书面语。口语中较少出现，选择中性语气通常较安全。
These words all share the stressed sound /ˈtendɪd/ (or /ˈstendɪd/ or /ˈsplendɪd/), so they rhyme with unattended. Beware lookalikes that sound different: unattached /ˌʌnəˈtætʃt/, unattested /ˌʌnəˈtɛstɪd/, and unattempted /ˌʌnəˈtɛmptɪd/ resemble the spelling but do not rhyme.
Dictionary facts from ECDICT, WIKTIONARY.