sniggering
adjective
[ ˈsnɪɡərɪŋ ]
• laughing in a half-suppressed, typically scornful way.
• "he wheeled around to confront a sniggering group of men hovering nearby"
sniggering
noun
• half-suppressed, typically scornful laughter.
• "they could not hide their sniggering at the thought"
snigger
verb
• laugh in a half-suppressed, typically scornful way.
• "the boys at school were sure to snigger at him behind his back"
Origin:
early 18th century: later variant of snicker.