unacceptable risk
unacceptable toxicity
unadjusted analyses
unaffected

unaffected areas
unaffected controls
unaffected eyes
unaffected family members
unaffected individuals

unaffected parents
unaffected pregnancies
unaffected relatives
unaffected siblings
unaffected side

unaffected skin
unaltered
unambiguous assignment
unambiguous characterization
unambiguous determination