Gál-smerc

According to the Old English Dictionary:

gál-smerc

adj. [smercian to smirk, smile] Light, laughing, giggling; pĕtŭlans :-- Gyf se munuc ne biþ gálsmerc and eáðe and hræde on hleahtre si mŏnăchus non sit pĕtŭlans, et făcĭlis et proclīvis ad ridendum, R. Ben. 7. gal-smerc