monotony

[ muh-not-n-ee ]
/ məˈnɒt n i /

noun

wearisome uniformity or lack of variety, as in occupation or scenery.
the continuance of an unvarying sound; monotone.
sameness of tone or pitch, as in speaking.

Origin of monotony

1700–10; < Late Greek monotonía, equivalent to monóton(os) monotonous + -ia -y3
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

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British Dictionary definitions for monotony

monotony
/ (məˈnɒtənɪ) /

noun plural -nies

wearisome routine; dullness
lack of variety in pitch or cadence
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012