When to Omit "Un"

I found a weird typo (or creative confession of unfaith) in a doctoral dissertation tonight. Aren't these guys supposed to be deeply clever? So David writes...

"I would like to dedicate this dissertation to my father and mother David Richard Woods, Jr. and Pearl Ernestine Graham who instilled a respect for others, appreciation for education, and an unabiding love and faith in my Lord and Savior Jesus Christ."

The word unabiding sounded weird to me, so I looked it up. This is what I found at dictionary.com:

"No results found for unabiding:
Did you mean unbinding?"

Who knew you could go to hell for having a bad vocabulary?