unparalleled atrocities
unpardonable error
unphilosophical dreamer
unpleasant excrescence [excrescence = abnormal enlargement]
unprecedented advance
unprejudiced intelligence
unpretentious character
unprincipled violence
unprofitable craft
unpurchasable luxury
unqualified submission
unquenchable tenderness
unquestionable genius
unquestioning fate
unreasonable pretense
unreasoning distrust
unredeemable forfeit
unrefreshing sameness
unrelaxing emphasis
unrelenting spirit
unremembered winter
unremitting toil
unrepining sadness
unreproved admiration
unrequited love
unresentful disposition
unreserved assent
unresisted authority
unresolved exceptions
unresponsive gloom
unresting speed
unrestrained anger
unrestricted ease
unrivaled distinction
unruffled concord
unsatisfied yearning
unscrupulous adventurer
unseasonable apology
unseemly mirth
unselfish fidelity
unsettled trait
unshakable foundation
unshrinking determination
unslackened volubility [volubility = ready flow of speech; fluent]
unsophisticated youth
unsparing abuse
unspeakable delight
unspiritual tone
unspoiled goodness
unstinted praise