suggestio falsi (L.), suggestion of something false.
sui generis (L.), of its own kind, peculiar.
summum bonum (L.), the chief good.
sunt lacrimæ rerum (L.), there are tears for things [unhappy].
sursum corda (L.), lift up your hearts [to God].
surtout, pas de zèle! (Fr.), above all, no zeal!
sutor ne supra crepidam judicaret (L.), let not the cobbler venture above his last.
suum cuique (L.), to each his own—let each have his own.
tabula rasa (L.), a smooth or blank tablet.
tædium vitæ (L.), weariness of life.