not following traditional rules
unconventional
not correct
inaccurate
too valuable to be substituted
irreplaceable
against the law
illegal
not able to be expected or foreseen
unpredictable
not faithful
disloyal
not suitable or proper
inappropriate
lacking respect
disrespectful
nothing else equals it
incomparable
not related to the topic
irrelevant
not clear enough to read
illegible
not reliable
irresponsible
not satisfactory or allowed
unacceptable
not sincere
dishonest
not able to be done
impossible
not staying the same, not continuing to do the same
inconsistent
