Question

reverend scheffler was a crusty, conservative fellow who usually preached to the general prisoners.
in the sentence above, crusty has the same or almost the same meaning as:
self - confident
self - serving
full - fledged
ill - tempered

Explanation:

"Crusty" can mean having a rough or harsh exterior, often indicating a bad - tempered or irritable nature. "Ill - tempered" also means having a bad temper. "Self - confident" means having confidence in oneself. "Self - serving" means serving one's own interests. "Full - fledged" means fully developed or complete.

Answer:

ill - tempered