This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. Sounded or spoken in an unvarying tone.

adj. Tediously repetitious or lacking in variety. See Synonyms at boring.

adj. having an unvarying tone or pitch

adj. tedious, repetitious or lacking in variety

adj. Uttered in one unvarying tone; continued with dull uniformity; characterized by monotony; without change or variety; wearisome.

Characterized by monotony; continued in the same tone without inflection or cadence; unvaried in tone.

Unvarying in any respect; tiresomely uniform.

adj. tediously repetitious or lacking in variety

adj. sounded or spoken in a tone unvarying in pitch

"This man says the city is much cooler in summer than the country: that spring visits the city earlier: that what we call the monotonous row of houses in a city street is far more beautiful than the irregularity of the country."

dull    unmodulated   

varied   

monotonous function   

monotony    monotone   

wearisome    dull    flat    samely    singsong    jog trot    dreary    drearisome    drear    routine   

dreary    dull    mournful    slow    tedious    rhythmic    uninteresting    sad    dismal    ceaseless