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Monotony (noun)
Tedium as a result of repetition or a lack of variety.
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Monotony (noun)
The property of a monotonic function.
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Monotony (noun)
The quality of having an unvarying tone or pitch.
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Monotonous (adjective)
Having an unvarying tone or pitch.
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Monotonous (adjective)
Tedious, repetitious or lacking in variety.
Wiktionary
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Monotony (noun)
lack of variety and interest; tedious repetition and routine
“you can become resigned to the monotony of captivity”
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Monotony (noun)
sameness of pitch or tone in a sound or utterance
“depression flattens the voice almost to monotony”
Oxford Dictionary