Humdrum and Threadbare

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

Threadbare and humdrum are semantically related In some cases you can use "Threadbare" instead an adjective "Humdrum".

Threadbare adjective - Used or heard so often as to be dull.

Humdrum and threadbare are semantically related in hackneyed topic. Sometimes you can use "Humdrum" instead an adjective "Threadbare".