I found this quote to be helpful from Robertson in distinguishing the difference between a predicate adjective and attributive adjective in terms of meaning:
The distinction between the attributive adjective and the predicate adjective lies in just this, that the predicated presents an additional statement, is indeed the main point, while the attributive is an incidental description of the substantive about which the statement is made.
…The more you know…
ἐνθύμησις 
Clear as mud
“A brilliant man spoke in chapel today.” (Attributive adjective.)
“The man who spoke in chapel today was brilliant.” (Predicate adjective.)
Hope this helps, Craig
G’Day,
Dave