monotony (noun) - wearisome routine as a result of lack of variety; unvarying tone, pitch, or color [muh-not-n-ee]
BREAKDOWN: MONO- (single) + TON- (tone) + -Y (state)
monotonous means unvarying, lacking in variety, or remaining the same; tedious
monotone describes sameness or uniformity of tone, pitch, or color, often to boring effect
SEE ALSO: monolithic
“The secret to happiness is to find a congenial monotony.” —Sean O'Casey