1. (n.) Any irksome sameness or lack of variety; as, the monotony of assembly line work\.

2. (n.) A frequent recurrence of the same tone or sound, producing a dull uniformity; absence of variety, as in speaking or singing.

AF alliteration assonance audio frequency boredom broken record ceaselessness chime clockwork regularity consecutiveness constancy constant flow continualness continuity continuousness daily round dingdong drone dryness endlessness ennui equilibrium even pace even tenor featurelessness flatness frequency fullness fundamental fundamental tone gaplessness harmonic harping humdrum incessancy intonation invariability irk irksomeness jingle jingle-jangle jointlessness monologue monotone monotonousness near rhyme orderliness overtone partial partial tone pitch pitter-patter plenitude regularity repeated sounds repetitiousness repetitiveness rhyme sameliness sameness seamlessness singsong slant rhyme smoothness stability stale repetition steadiness steady state successiveness tedium the beaten track the daily round the round the squirrel cage the treadmill the weary round tone tonelessness treadmill trot unbrokenness undeviation undifferentiation uniformity unintermittedness uninterruptedness uninterruption unnecessary repetition unrelievedness unvariation wearisome sameness