4 adjectives to describe snickering

" The suggestion of Stoddard's making advances of unseemly warmth to Mandy Meacham produced a subdued snicker.

" After a little snicker, he added: "Hed all 't wus good fer me the las' time.

" "And isn't saying what he should," added Sister Green, with a sly snicker, which went around the room softly.

It should be cultivated till, in an honest way, it supplants, at least, the universal snicker.

4 adjectives to describe  snickering