1
be assiduous in sth/doing sth
表示在某方面或做某事时勤奋专注，介词 in 后接名词或动名词。
She is assiduous in her studies and always finishes her homework early.
她学习刻苦，总是早早完成作业。
勤勉的；刻苦的
先理解核心含义，再看它在真实句子里的用法。
勤勉的；刻苦的
marked by care and persistent effort
She is assiduous in her studies and always finishes her homework early.
她学习刻苦，总是早早完成作业。
勤奋的,勤勉的,或准时(出席或工作)的；勤劳的。
Hard-working, diligent or regular (in attendance or work); industrious.
以细心和坚持不懈的努力为特征
marked by care and persistent effort
She was assiduous in her efforts to learn Chinese.
她努力学习中文，十分勤勉。
AI contextual example
His assiduous reading of the documents helped him find the error.
他刻苦研读文件，这才帮他发现了错误。
AI contextual example
Through assiduous practice, the team finally won the championship.
通过刻苦的训练，队伍最终赢得了冠军。
AI contextual example
her assiduous attempts to learn French
她学习法语的不懈努力。
WordNet
表示在某方面或做某事时勤奋专注，介词 in 后接名词或动名词。
She is assiduous in her studies and always finishes her homework early.
她学习刻苦，总是早早完成作业。
at 后接具体工作或活动，强调持之以恒的认真态度。
He is assiduous at the task, checking every detail carefully.
他做这项任务很勤勉，仔细检查每个细节。
常用固定搭配，强调为达到目标反复下功夫。
The team was assiduous in its efforts to meet the deadline.
团队为赶上截止日期而孜孜不倦地努力。
Not this
He is an assiduous.
Use this
He is assiduous.
assiduous 是形容词，不能单独作名词用在不定冠词后；此处应作表语，直接说 He is assiduous。若想保留冠词，则需补上名词，如 He is an assiduous student。
Not this
He studies assiduous.
Use this
He studies assiduously.
修饰动词 study 要用副词 assiduously，而不能用形容词 assiduous。形容词只修饰名词或作表语，不能修饰动词。
Not this
She is assiduous on studying English.
Use this
She is assiduous in studying English.
表示“在某方面勤奋”时，assiduous 通常与介词 in 搭配，接名词或动名词，不用 on。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
勤奋的学生
She was an assiduous student who always finished her homework early.
她是个勤奋的学生，总是早早完成作业。
勤奋的员工
The manager praised the assiduous worker for meeting every deadline.
经理称赞这位勤奋的员工，因为他赶上了每个截止日期。
坚持不懈的努力
Thanks to his assiduous efforts, the project was completed ahead of schedule.
多亏了他坚持不懈的努力，项目提前完成了。
细心的关注
The translator gave the text assiduous attention to every detail.
译者对文本的每一个细节都给予了细心的关注。
刻苦学习
Years of assiduous study made him an expert in ancient languages.
多年的刻苦学习使他成为古代语言专家。
刻苦练习
Her assiduous practice paid off when she won the piano competition.
她刻苦练习，最终在钢琴比赛中获胜，得到了回报。
Use assiduous naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 assiduous 中段'sid'像 sit（坐），一直坐着专注做事——勤勉刻苦。
语域：formal 常见场景：academic writing、performance reviews、formal recommendations 该词为正式用词，多用于书面或正式场合，强调持续而认真的努力。日常口语中较少见，通常用hardworking或diligent更自然。
None of these words rhymes with assiduous /əˈsɪdwəs/. The spelling ending -uous is a trap: it is usually pronounced /juəs/ or /uəs/ (continuous /kənˈtɪnjuəs/, strenuous /ˈstrenjuəs/, etc.), while assiduous has /dwəs/. Compare the consonant cluster after the stressed vowel.
Dictionary facts from ECDICT, WIKTIONARY.