1814, diminutive from sermon + -ette. Poe used sermonoid (1849); sermuncle (1886) also has been tried. English writers have turned to the Italian double diminutive sermonettino (1818) to describe notably trifling efforts.
serious
seriously
seriousness
sermocination
sermon
sermonette
sermonize
serology
serotine
serotonin
serous