Webster's English Dictionary

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gruesome

Cross references:
  1. ghastly               
 
grue.some \'gru:-s*m\ aj [alter. of earlier growsome, fr. E dial. grow, 
   grue to shiver], fr. ME gruen, prob. fr. MD gru-wen; akin to OHG ingru-e-n 
   to shiver : inspiring horror or repulsion : GRISLY  - grue.some.ly av