Jisho

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Na-adjective (keiyodoshi)
1. negligent; careless​Usually written using kana alone, See also 忽せにする, usu. adverbially as ~に
Archaic/formal form of na-adjective
2. easygoing; relaxed​Usually written using kana alone, Archaic, Only applies to ゆるがせ
Other forms
忽せ 【いるかせ】
Notes
いるかせ: Out-dated or obsolete kana usage.

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