As __as a Mule
This page is the CodyCross answer for the clue below from Department Store, Group 502, Puzzle 5 (Helpful Staff).
Question is: As __as a Mule
and the answer is: STUBBORN
Word Meaning:
STUBBORN — Refusing to move or to change one's opinion; obstinate; firmly resisting; persistent in doing something.
Definitions from Wiktionary.