Affectionate, harmonious, and friendly — describing a close, warm relationship (e.g., between family members or friends).
両親は長年連れ添い、今でもとても睦まじい。
My parents have been together for many years and are still very affectionate toward each other.
クラスの雰囲気が睦まじく、皆で助け合っている。
The class atmosphere is harmonious; everyone helps one another.
彼らはいつも睦まじく話している様子だった。
They always seemed to be talking affectionately with each other.