ETYMOLOGY
from annoy (n.) + -ful
EXAMPLE
“…And eek men seyn þat thilke Iuge is wys þat soone vnderstondeth a matere & Iuggeth by leyser for al be it so þat al taryyng be anoyful algates it is nat to repreue...”
From: The Hengwrt manuscript of Chaucer’s Canterbury Tales
Lexicophilia 