Jisho

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Adverb (fukushi)
1. increasingly; more and more​Usually written using kana alone
Adverb (fukushi)
2. decreasingly; less and less​Usually written using kana alone, when declining
Other forms
益 【ますます】、増々 【ますます】、増す増す 【ますます】
Notes
増々: Rarely-used kanji form. 増す増す: Rarely-used kanji form.

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