Alexander Аkimovadded a comment 7 years agostrong moral употребляется чаще, чем deep moral: https://books.google.com/ngrams/graph?content=strong+moral%2Cdeep+moral&year_start=1800&year_end=2000&corpus=17&smoothing=3&share=&direct_url=t1%3B%2Cstrong%20moral%3B%2Cc0%3B.t1%3B%2Cdeep%20moral%3B%2Cc0