How to say "Deep" in Japanese

When translating "deep" into Japanese, you must choose carefully between 思案投げ首 and 耽読. In Japanese, 思案投げ首 (しあん投げ首 (shian-nagekubi)) is typically associated with "deep in thought with a bowed head, pondering deeply, in a quandary" (Syllabus Level: N2) and represents An idiom describing a state of deep contemplation, often accompanied by a dejected or puzzled expression, with one's head bowed. Implies struggling to find a solution to a difficult problem. 難しい問題について深く考え込み、頭を垂れて困惑している様子を表す慣用句です。解決策が見つからずに悩んでいる状態を指します。. On the other hand, 耽読 (たんどく (tandoku)) maps to "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.. A literal translation of "deep" can often sound unnatural to native Japanese speakers if mixed up!