leering

(verb) look suggestively or obliquely; look or gaze with a sly, immodest, or malign expression. Synonyms: leer. Example: "The men leered at the young women on the beach."

(adj) showing sly or knowing malice in a glance. Example: "She had run in fear of...his evil leering eye"- amy lowell."

(adj) (of a glance) sidelong and slyly lascivious. Example: "Leering drugstore cowboys."