ETYMOLOGY
from Latin dicax, dicaci-(talking sharply) + -ous
EXAMPLE
“…Giovanni (or Lanciotto) deputes his more blandishing and dicacious brother to be his proxy in the marriage ceremonies; and afterwards, as the morning breaks, when the susceptible lady actually discovers her husband to be a wise, stern, moral man…”
From: The North American Magazine
Volume 4, 1834
Francesca Da Rimini
A Tragedy by Silvio Pellico
Lexicophilia 