quotidian
recalcitrant
recant
reconcile
refractory
relinquish
renounce
repudiate
repugnance
rescind
restive
reticent
reverberant
revere
revile
rigorous
riveting
rudimentary
rueful
ruminate
salubrious
sanguine
shore up
solicitous
spurious
squalid
strive
subvert
supercilious
superfluous