Natyashastra
अथाधमानाम् - अस्थानहसितं यत्तु साश्रुनेत्रं तथैव च । उत्कम्पितांसकशिरस्तच्चापहसिअतं भवेत् ॥ ९॥
Now, concerning the inferior type: "Laughter that is inappropriate to the situation, accompanied by tearful eyes, trembling shoulders, and a shaking head, is known as Apahasita (False Laughter)."
english translation
athAdhamAnAm - asthAnahasitaM yattu sAzrunetraM tathaiva ca । utkampitAMsakazirastaccApahasiataM bhavet ॥ 9॥
hk transliteration by Sanscript