monotonous (adj.)

• alliterative
• articulated
• assonant
• banal
• banausic
• boring
• ceaseless
• chanting
• colorless
• commonplace
• connected
• constant
• continual
• continued
• continuing
• continuous
• cyclical
• dim
• direct
• drab
• dreary
• dry
• dull
• dusty
• endless
• everlasting
• everyday
• featureless
• gray
• ho-hum
• humdrum
• immediate
• incessant
• interminable
• invariable
• joined
• labored
• linked
• long-winded
• mechanical
• monotone
• monotonic
• never-ending
• nonstop
• ordinary
• pedestrian
• perennial
• periodic
• poky
• prolix
• prosaic
• recurrent
• repetitious
• repetitive
• rhymed
• rhyming
• round-the-clock
• routine
• run-of-the-mill
• running
• same
• seamless
• serried
• singsong
• smooth
• soporific
• stable
• steady
• stodgy
• straight
• tedious
• tiresome
• tiring
• unbroken
• unceasing
• undifferentiated
• unending
• uneventful
• unexciting
• uniform
• uninteresting
• uninterrupted
• unrelieved
• unremitting
• unvaried
• unvarying
• wearisome
• wearying