Making deaf or causing extreme loudness; excessively loud or noise-producing.
From 'bedeafen' + '-ing' (present participle). This archaic adjective preserves a more intense version of 'deafening.'
The fact that we had 'bedeafening' but it died out while 'deafening' survived tells us something about how language selects words: sometimes the simpler form wins, regardless of how emphatic the complex version sounds.
Complete word intelligence in one call. Free tier — 50 lookups/day.