a suffix forming nouns or adjectives, sometimes a diminutive of the base word and usually confined to informal and jocular use (bitsy; footsie; halvsies); adjectives formed with -sy may be ironic, implying that the quality in question is self-consciously assumed or feigned (artsy; cutesy; folksy).

Sy Look up sy or Sy in Wiktionary, the free dictionary. Sy is a given name, nickname/ hypocorism (often of Seymour) and surname which may refer to: