He sniggered.
He didnt like to think of himself as the sort of person who giggled or sniggered but he had to admit that he had been giggling and sniggering almost continuously for well over half an hour now.

Advertising Disclosure: Please note that many links to retailers are affiliate links, which yields a commission for us. allauthor.com is a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for sites to earn advertising fees by advertising and linking to Amazon sites.