Scrupulous means careful and honest; conscientious.
Ruckus means a noisy disturbance; an uproar.
Rueful means feeling or showing regret.
Sagacity means wisdom and good judgement.
Satiated means fully satisfied.
Satire means mockery that exposes faults.
Scenario means an imagined sequence of events.
Sceptical means doubtful; not easily convinced.
Replete means filled or well supplied with something.
Repository means a place where things are stored.
Rescinded means cancelled or revoked.
Retrospect means a review of past events.
Revitalize means to give new life or energy to.
Roster means a list of names, often for duties.
Rout means a crushing defeat.
Rowdy means noisy and disorderly.
Repentance means deep regret for wrongdoing.
Reclusive means living alone and avoiding people; hermit-like.
Redundant means no longer needed; unnecessary.
Regress means to go back to an earlier state.
Rejoinder means a reply, especially a sharp one.
Relegate means to move to a lower position.
Relinquish means to give up or let go of.
Remorse means deep regret or guilt for a wrong done.
Renascent means being reborn; showing renewed strength.