The act of ignoring or snubbing; a deliberate act of neglect or discourtesy.

(obsolete) Sleight.

(transitive) To treat as unimportant or not worthy of attention; to make light of.

(transitive) To give lesser weight or importance to.

(transitive) To treat with disdain or neglect, usually out of prejudice, hatred, or jealousy; to ignore disrespectfully.

(intransitive) To act negligently or carelessly. (Can we add an example for this sense?)

(transitive, military, of a fortification) To render no longer defensible by full or partial demolition.

(obsolete, transitive) To make even or level.

(transitive) To throw heedlessly.

An adjective "slight" describes something small, gentle or weak, not thorough or important, and not far away in space or time.

Of slender build.

(regional) Even, smooth or level.

(especially said of the sea) Still; with little or no movement on the surface.

(obsolete) Foolish; silly; not intellectual.

(regional, obsolete) Bad, of poor quality.

(dated) Slighting; treating with disdain.