Humdrum and Matter-of-course

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

Matter-of-course and humdrum are semantically related In some cases you can use "Matter-of-course" instead an adjective "Humdrum".

Matter-of-course adjective - Expected or depended upon as a natural or logical outcome.

Humdrum and matter-of-course are semantically related in usual topic. Sometimes you can use "Humdrum" instead an adjective phrase "Matter-of-course", if it concerns topics such as common.