Related words よく よく is a general adverb for 'well' or 'often'. とくと emphasizes deliberate, thorough attention and is less common in everyday speech.
じっくり じっくり means 'carefully' or 'taking one's time', similar to とくと , but とくと can sound more formal or emphatic.
Written forms とくと Usage 87%
Usually written in kana. The kanji form 篤と is rare and may not be recognized by many readers.
篤とく と Usage 13%
Rare kanji spelling; the kana form is strongly preferred in modern usage.
Etymology The origin is uncertain. The kanji 篤 means 'sincere' or 'earnest', which fits the adverbial meaning, but the word is now treated as a lexicalized adverb usually written in kana.
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