Jejune and Mild-mannered

Jejune adjective - Causing weariness, restlessness, or lack of interest.

Mild-mannered and jejune are semantically related In some cases you can use "Mild-mannered" instead an adjective "Jejune".

Mild-mannered adjective - Behaving in or having a mild or gentle manner.

Jejune and mild-mannered are semantically related in easygoing topic. Sometimes you can use "Jejune" instead an adjective phrase "Mild-mannered".