salient feature
salutary amusement
sanctimonious hypocrite [sanctimonious = feigning piety]
sane observer
sanguinary measures [sanguinary = eager for bloodshed; bloodthirsty]
sanguine expectations [sanguine = cheerfully confident; optimistic]
sarcastic incredulity
sardonic taciturnity [sardonic = cynically mocking] [taciturnity = habitually untalkative]
satirical critic
satisfying equipoise [equipoise = equilibrium]