humdrum
US /ˈhʌm.drʌm/
UK /ˈhʌm.drʌm/

1.
lacking excitement or variety; monotonous; dull.
:
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Their lives were a series of humdrum tasks.
•
He found his new job rather humdrum.
1.
monotony; dullness.
:
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He longed to escape the humdrum of daily life.
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The constant humdrum of the office made him restless.