To laugh at someone or something in a silly and often unkind way. (Cambridge Dictionary)
Give a half-suppressed, typically scornful laugh; snigger. (Oxford Dictionaries)
To laugh in a covert or partly suppressed manner. (Merriam – Webster)
If you snicker, you laugh quietly in a disrespectful way, for example at something rude or embarrassing. (Collins Dictionary)
Vocabulary: Shades of Meaning.
Shades of meanings verb cards.