monotonously (adv.)

• boringly
• ceaselessly
• constantly
• continually
• continuously
• cumulatively
• dully
• endlessly
• equably
• evenly
• everlastingly
• incessantly
• interminably
• perennially
• repetitively
• routinely
• tediously
• tiresomely
• together
• unceasingly
• uniformly
• uninterruptedly