"leering" in the verb sense
look suggestively or obliquely look or gaze with a sly, immodest, or malign expression
"The men leered at the young women on the beach"
"leering" in the adjective sense
showing sly or knowing malice in a glance
"she had run in fear of...his evil leering eye"- Amy Lowell
of a glance) sidelong and slyly lascivious
"leering drugstore cowboys"
Source: WordNet® (An amazing lexical database of English)
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