Defeated soundly (8)
(Other definitions for thrashed that I've seen before include "given whitewashing" , "Beat soundly" , "Beaten soundly" , "Beat violently" , "severely punished" .)
(Other definitions for routed that I've seen before include "Decisively defeated" , "Vanquished" , "Sent in particular direction by way of detour" , "Sent (by a particular path)" , "Sent on a particular course" .)