仲睦まじい

1. Origins, structure, and basic meaning

• Structure: 仲睦まじい (なかむつまじい) is an inflecting adjective for two people having a very affectionate and harmonious relationship.
• Basic usage: 夫婦は仲睦まじい predicates the elderly couple’s present closeness, while 仲睦まじく歩く uses an adverbial form for the affectionate way two people walk together.

2. Common pitfalls and similar expressions

• Predicative and adverbial forms
  • 仲睦まじい predicates a state, whereas 仲睦まじく changes ending to modify 歩く. The second does more than neutrally state that two people walk in the same direction.