喜よろこんで

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Meanings

1

Expresses cheerful willingness to do something; often used when accepting a request or invitation.

Shall I help you? — Yes, with pleasure.

彼かれは喜よろこんでその仕し事ごとを引ひき受うけた。

He gladly took on the task.

喜よろこんで〈動どう詞し〉to do something gladly/willingly
喜よろこんでお手伝てつだいします。
I'll be glad to help.
喜よろこんで〈事こと〉を引ひき受うけるto gladly take on (a task, role, etc.)
彼かれはその仕し事ごとを喜よろこんで引ひき受うけた。
He gladly took on the job.
喜よろこんで〈事こと〉に応おうじるto gladly agree to/comply with (a request, invitation)
彼かの女じょは招しょう待たいに喜よろこんで応おうじた。
She gladly accepted the invitation.

快こころよく
快く and 喜んで both mean 'willingly', but 快く stresses a gracious, unhesitating attitude while 喜んで stresses cheerful eagerness.
進すすんで
進んで emphasizes doing something on one's own initiative, whereas 喜んで emphasizes doing it happily, often in response to a request.

いやいやN1
嫌々 means doing something reluctantly and unwillingly, the opposite of doing it 喜んで, gladly and willingly.

嬉うれしいN4
嬉しい is an adjective describing the feeling of happiness, while 喜んで is an adverb describing willingness to act.

喜よろこんで
Standard kanji spelling; the most frequent written form.
悦よろこんで
rarely-used kanji form
Rarely used kanji form; learners should recognize it but use 喜んで.

The て-form of the verb 喜ぶ (to be pleased), used adverbially.