vast knowledge; deep erudition; store of expertise
Often used when someone shows off or shares detailed knowledge on a niche topic. Can carry a slightly pedantic or enthusiastic tone.
He started sharing his vast knowledge about history.
Showing off his extensive knowledge is his hobby.
Usually written in kana; the kanji forms 蘊蓄 and 薀蓄 are rare and may not be recognized by all readers.
Katakana spelling sometimes used for emphasis or in casual writing.
Variant kanji form using 薀 (a variant of 蘊). Even rarer than 蘊蓄.
Original kanji form, now uncommon. 蘊 means 'accumulate' and 蓄 means 'store up'.
Search-only mixed kanji-kana form; not a standard spelling.
From Chinese 蘊蓄 (yùnxù), meaning 'to accumulate and store'. The Japanese reading うんちく is the on'yomi. The word originally referred to storing up knowledge, and later came to mean the deep knowledge itself.