名詞 humdrum:

1. the quality of wearisome constancy, routine, and lack of variety
   同義詞：monotony, sameness

形容詞 humdrum:

1. not challenging; dull and lacking excitement
   同義詞：commonplace, prosaic, unglamorous, unglamourous
2. tediously repetitious or lacking in variety
   同義詞：monotonous

hum.drum

adj.（形容詞）
Lacking variety or excitement; dull.See Synonyms at boring See Synonyms at dull
單調的，平凡的：缺少變化或刺激的；無生氣的參見 boring參見 dull
n.（名詞）
Monotonous talk or routine.
乏味的談話：單調的談話或老一套

來源：
Probably from hum
可能源自 hum