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Synonyms for Sidelong (same or very similar meaning)

WordNet sense 1 (situated at or extending to the side):
lateral

WordNet sense 2 (located on a side):
side

WordNet sense 3 (at an angle to the horizontal or vertical position):
inclined

WordNet sense 4 ((used especially of glances) directed to one side with or as if with doubt or suspicion or envy):
askance, squint, askant, asquint, squint-eyed, squinty

WordNet sense 5 (to, toward or at one side):
obliquely, sideways


From the ODE community, based on WordNetadd/edit