"disparaging, treating with derogatory indifference," 1630s, present-participle adjective from slight (v.). Related: Slightingly.
Entries linking to slighting
slight v.
c. 1300, slighten, "make plain or smooth with a sleek-stone," from slight (adj.); hence also "adorn oneself" (early 14c.) and in 17c. often "raze, level" (fortifications, cities, etc.). These senses are obsolete. The meaning "treat with indifference" (1590s) is from the adjective in the sense of "having little worth." Related: Slighted; slighting. As a verb the Elizabethan dramatists also used slighten.