to snicker slyly

Translations
хитро хихикать
ехидно похихикивать
хихикать украдкой
плутовски хихикать
Definitions
To laugh quietly in a sly or mischievous way.
To give a suppressed, often mocking or derisive laugh while trying not to attract attention.
Words
to

functional word
частица инфинитива
snicker

verb
хихикать
slyly

adverb
лукаво