Rarefied
made less dense (of a gas)
Recalcitrant
obstinately stubborn; determined to resist authority, unruly
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Recant
disclaim or disavow, retract a previous statement, openly confess error
Recluse
hermit, loner
Recondite
abstruse, profound, secret
Refractory
stubborn, unmanageable
Refute
disprove
Relegate
banish to an inferior position, delegate, assign
Reproach
express disapproval or disappointment
Reprobate
person hardened in sin, devoid of a sense of decency
Repudiate
disown, disavow
Rescind
cancel