unsullied virtue
unsurpassed purity
unswerving integrity
untameable energy
unthinkable hypothesis
untiring energy
untold calamity
untoward circumstances [untoward = improper]
untrammeled expression
untrodden woodland
untroubled repose
untuneful phrase
untutored mind
unusual audacity
unutterable sadness
unvarnished feeling
unwarranted limitation
unwasting energies
unwavering allegiance
unwearied diligence
unwelcome alliance
unwieldy bulk
unwilling homage
unwittingly mingled
unwonted kindness [unwonted = unusual]
unworldly foolishness
unworthy alliance
unyielding nature
uproarious laughter
upstart pretensions
useless fripperies [fripperies = pretentious, showy]
utmost scorn
V
vacant stupidity
vacillating obedience
vacuous ease
vagabondish spirit
vagrant wandering
vaguely discursive
vain contemplation
vainglorious show
valid objection
valuable acquisition
valueless assertion
vampire tongue
vanished centuries
vantage ground
vapid generalities [vapid = lacking liveliness, interest; dull]
variable temperament
variegated career [variegated = varied]