featureless (adj.)

• abstract
• amorphic
• amorphous
• anarchic
• articulated
• baggy
• bare
• barren
• bland
• blank
• bleached
• blurred
• blurry
• broad
• ceaseless
• chaotic
• characterless
• clear
• collective
• confused
• connected
• constant
• continual
• continued
• continuing
• continuous
• cyclical
• devoid
• direct
• disorderly
• empty
• endless
• formless
• fuzzy
• general
• generalized
• generic
• hazy
• hollow
• immediate
• inane
• incessant
• inchoate
• indecisive
• indefinite
• indeterminate
• insipid
• interminable
• joined
• kaleidoscopic
• linked
• lumpen
• misty
• monotonous
• nebulous
• neutral
• never-ending
• nondescript
• nonspecific
• nonstop
• null
• obscure
• perennial
• periodic
• recurrent
• repetitive
• round-the-clock
• running
• seamless
• serried
• shapeless
• smooth
• stable
• steady
• straight
• unbroken
• unceasing
• unclear
• undefined
• undifferentiated
• unending
• uniform
• uninterrupted
• unordered
• unorganized
• unrelieved
• unremitting
• unspecified
• vacant
• vacuous
• vague
• void
• white
• wide