Blah and Humdrum

Blah noun - Language, behavior, or ideas that are absurd and contrary to good sense.

Humdrum and blah are semantically related in dull topic. In some cases you can use "Humdrum" instead an adjective "Blah".

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

Blah and humdrum are semantically related in boring topic. You can use "Blah" instead an adjective "Humdrum".