1. (

• humdrum ,
• monotonous

) tediously repetitious or lacking in variety; "a humdrum existence; all work and no play"; "nothing is so monotonous as the sea" ;

2. (

• flat ,
• monotone ,
• monotonic ,
• monotonous

) sounded or spoken in a tone unvarying in pitch; "the owl's faint monotonous hooting" ;