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wilfully do sth
wilfully 修饰动词时，常表示“故意地、蓄意地”。
She wilfully ignored the warning signs.
她故意无视了警告标志。
任性固执地
先理解核心含义，再看它在真实句子里的用法。
任性固执地
stubbornly; obstinately
She wilfully ignored the warning signs.
她故意无视了警告标志。
故意地,有意地。
Deliberately, on purpose.
She wilfully ignored the warning signs.
她任性固执地无视了那些警告标志。
He wilfully damaged the library book and had to pay a fine.
他蓄意损坏了图书馆的书，不得不支付罚款。
The child wilfully refused to eat his vegetables.
那个孩子任性地拒绝吃蔬菜。
wilfully 修饰动词时，常表示“故意地、蓄意地”。
She wilfully ignored the warning signs.
她故意无视了警告标志。
wilfully 与 mislead 搭配在法律或正式语境中常见，强调主观故意。
The company was accused of wilfully misleading investors.
该公司被指控故意误导投资者。
be wilfully blind to sth 是常用搭配，表示“对……故意视而不见”。
Many were wilfully blind to the injustice.
许多人对不公现象故意视而不见。
Not this
He wilful broke the glass.
Use this
He wilfully broke the glass.
broke 是动词，需要副词修饰；wilful 是形容词，不能作状语，应改为副词 wilfully（故意地）。
Not this
She willingly ignored the safety rules.
Use this
She wilfully ignored the safety rules.
若表达“故意、明知故犯地”，willingly（心甘情愿地）语义不符，因为它不含贬义的蓄意；wilfully 才表示“蓄意地、任性地”，准确说明她有意违规。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
蓄意无视；故意忽视
He wilfully ignored the advice of his doctors.
他蓄意无视医生的建议。
故意不守规矩；任性胡闹
The child was punished for wilfully misbehaving during the lesson.
那孩子因为在课堂上故意调皮捣蛋而受到惩罚。
执意拒绝；蓄意拒不
She wilfully refused to cooperate with the investigation.
她执意拒绝配合调查。
蓄意阻挠；蓄意妨碍
He was arrested for wilfully obstructing a police officer.
他因蓄意妨碍警察执行公务而被捕。
蓄意损坏；蓄意破坏
Anyone who wilfully damages public property will be fined.
任何人蓄意损坏公共财产都将被罚款。
故意视而不见的
The company was wilfully blind to the safety risks in its factory.
该公司对工厂中的安全风险故意视而不见。
刻意无视的
It's hard to help someone who is wilfully ignorant about their health.
很难帮助一个对自身健康刻意无视的人。
因为我们得知真道以后，若故意犯罪，赎罪的祭就再没有了。
From the King James Version of the Bible, Hebrews 10:26; this verse is commonly cited in discussions about deliberate sin.
出自钦定版《圣经》希伯来书10:26；这节经文常被用来探讨故意犯罪的问题。
Use wilfully naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
wilfully 拆成 will（意志）+ fully（满满），脑海浮现“意志满满、一意孤行”的人，蓄意任性去做。
语域：formal 常见场景：law、literature wilfully 多用于正式文体和法律语境，表示“蓄意地”；在文学或记叙文中也可表示“任性固执地”。口语中比较少见，整体偏正式。
Of these, only skilfully (also spelled skillfully) truly rhymes with wilfully: both stress /ɪl/ and end in /fəli/. Wishfully and wistfully also begin with /wɪ/ but have a different consonant (/ʃ/ or /st/) before /fəli/, so they do not rhyme. Beautifully, playfully, and peacefully share the spelling -fully but have a different stressed vowel, so they are only lookalikes.
Dictionary facts from ECDICT, WIKTIONARY.