implacable
inalienable
incomprehensible
inconceivable
inconsolable
incontestable
incontrovertible
indefinable
indestructible
indigestible
indubitable
inedible
inestimable
inexplicable
inexpressible
intolerable
invisible
non-negotiable
unacceptable
unaccountable
unacknowledgeable
unadjustable
unadvisable
unaffordable
unalterable
unanalysable
unanswerable
unappeasable
unapproachable
unarguable
unassiociable
unattachable
unattainable
unavailable
unavoidable
unbearable
unbeatable
unbelievable
unbendable
unbreachable
unbreakable
unbreathable
unchangeable
unclassifiable
unconquerable
unconscionable
uncontactable
uncontainable
uncontrollable
uncountable
undecipherable
undefeatable
undetectable
undoubtable
undrinkable
uneducable
unelectable
unemployable
unendurable
unenforceable
unenviable
unexceptionable
unfanciable
unfathomable
unfavourable
unfeasible
unflappable
unforgettable
unforgivable
ungovernable
ungrammatical
unidentifiable
unimaginable
uninsurable
unintelligible
unknowable
unlikable
unliveable
unmanageable
unmatchable
unmentionable
unmissable
unmistakable
unnoticeable
unobtainable
unpardonable
unplaceable
unplayable
unpredictable
unpreventable
unprintable
unprofitable
unpronounceable
unpunishable
unquantifiable
unquenchable
unquestionable
unreachable
unreadable
unreasonable
unreliable
unrepeatable
unrepeatable II
unseasonable
unserviceable
unshakeable
unshockable
unsociable
unstable
unstoppable
unsuitable
unsupportable
unsurpassable
unsustainable
untameable
unthinkable
untouchable
untraceable
untransferable
untreatable
unverifiable
unviable
unworkable