The word monotonous is an adjective that refers to a tedious and repetitious act or task. This act will normally tend to lack a lot in interest and variety. Some of its synonyms are humdrum, drab, flat, dull and monotone.
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what does monotonous mean
lacking in variety; tediously unvarying: the monotonous flat scenery.
characterizing a sound continuing on one note.
having very little inflection; limited to a narrow pitch range.