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Adjective: unsustainable
  1. Not able to be sustained
    "A farm which is overstocked with sheep or cattle is unsustainable"

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unsurpassable
unsurpassed
unsurprised
unsurprising
unsusceptibility
unsusceptible
unsuspected
unsuspecting
unsuspectingly
unsuspicious
unsustainable
unswayed
unsweet
unsweetened
unswept
unswerving
unswervingly
unsworn
unsyllabic
unsyllabled
unsymbolic