/ ˈmɒnətəʊn; NAmE ˈmɑːnətoʊn/ noun , adjective
■ noun
[ sing. ] a dull sound or way of speaking in which the tone and volume remain the same and therefore seem boring :
He spoke in a flat monotone.
■ adjective
[ only before noun ] without any changes or differences in sound or colour :
He spoke in a monotone drawl.
monotone engravings
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WORD ORIGIN
mid 17th cent.: from modern Latin monotonus , from late Greek monotonos .