How to say "Deep" in Japanese

When translating "deep" into Japanese, you must choose carefully between 耽読 and 懊悔. In Japanese, 耽読 (たんどく (tandoku)) is typically associated with "deep reading, avid reading, perusing avidly" (Syllabus Level: N1) and represents 一つの書物や文章に深く没頭して読むこと。時間を忘れて読みふける様子を表し、非常に集中して楽しんでいるニュアンスがあります。It means to deeply immerse oneself in reading a single book or text. It describes the state of becoming engrossed in reading, forgetting the passage of time, and has the nuance of being highly concentrated and enjoying it.. On the other hand, 懊悔 (おうかい (ōkai)) maps to "deep regret, remorse, compunction, agony of regret" (Syllabus Level: N1) and represents 「後悔」よりもはるかに強い、激しい悔やみや苦しみを伴う後悔を表します。自分の過ちに対して深く苦しむ様子を指します。/ Expresses a far stronger and more intense regret than 'kōkai', accompanied by anguish and suffering. It refers to deeply suffering over one's own mistakes.. A literal translation of "deep" can often sound unnatural to native Japanese speakers if mixed up!