deep

1. Origins, structure, and basic meaning

• Structure: 深 has 11 strokes and denotes depth and the strength of feelings or relationships.
• Basic usage: 深い is read ふかい, and 深まる is read ふかまる.

2. Common pitfalls and similar expressions

• Being deep and becoming deeper
  • 岸の近くでも深い describes being deep even near the shore.
  • 二人の友情が深まりました describes a change: the two people's friendship grew stronger.
• The strength of an impression
  • 胸に深く残りました changes 深い to 深く to describe how deeply something remained in one's mind.