-t ə nəs also -tn- adjective
Etymology: Greek monotonos, from mon- + tonos tone — more at tone
1. : uttered or sounded in one unvarying tone : marked by a sameness of pitch and intensity
an owl kept up a faint monotonous hooting — Louis Bromfield
tried to keep his voice calm and monotonous as he spoke — Elinor Wylie
2. : having no change or variety : wearisomely uniform : repetitious
the trim monotonous cottages — W.F.Jenkins
this waste of mud, water and monotonous vegetation — Wilfred Thesiger