monotonous

From monotone +‎ -ous.

• (Received Pronunciation) enPR: mə-nŏtʹən-əs, IPA^(key): /məˈnɒtənəs/

• Audio (Southern England):

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• (General American) enPR: mə-nŏtʹən-əs, IPA^(key): /məˈnɑtənəs/
• Hyphenation: mo‧no‧ton‧ous

monotonous (comparative more monotonous, superlative most monotonous)

1. Having an unvarying pitch or tone.

   Synonyms: level, monotone, monotonic

   • 1825 June 22, [Walter Scott], chapter V, in Tales of the Crusaders. […], volume I (The Betrothed), Edinburgh: […] [James Ballantyne and Co.] for Archibald Constable and Co.; London: Hurst, Robinson, and Co., →OCLC, page 95:

     "But my daughter—but the Lady Eveline"—said the Fleming, with some slight change in his monotonous voice, which seemed to express doubt and perplexity—"You are cruel conquerors, and—"

2. Tedious, repetitious, or lacking in variety.

   Synonyms: samely, routine; see also Thesaurus:repetitive, Thesaurus:steady, Thesaurus:wearisome

   Antonym: various

   • 1834, L[etitia] E[lizabeth] L[andon], chapter VII, in Francesca Carrara. […], volume III, London: Richard Bentley, […], (successor to Henry Colburn), →OCLC, page 49:

     [L]istening for a moment, she heard the monotonous and heavy tread of the soldier echoing through the passage.

• monotone
• monotony

• ontonomous