1. a person who sniggers; one who laughs in a half-suppressed, typically scornful way

Examples

• The sniggerer in the back row disrupted the serious presentation.
• She ignored the sniggerers and continued with her speech.
• The teacher silenced the sniggerer with a stern look.
• He was known as the class sniggerer, always finding something amusing.
• The sniggerer’s quiet laughter was still audible during the ceremony.
• Despite the sniggerers in the audience, the performer maintained composure.