Definition of monotonal in English:

monotonal

Pronunciation /mɒnəˈtəʊnl/

adjective

  • 1Of music, speech, etc.: having little or no variety in tone or pitch. Of a person: speaking in a monotone.

  • 2Of or in a single colour.

Origin

1930s; earliest use found in Science. From mono- + tonal, after monotone.