7 letters · 14 points in Scrabble
adjective shockingly repellent; inspiring horror
adjective gruesomely indicative of death or the dead
originFrom a conflation of gastly, from Middle English gastly, from gasten (from Old English gǣstan (“to torment, frighten”)) + -ly, and ghostly (which was also spelt gastlich in Middle English). Equivalent to ghast/gast + -ly. Spelling with gh developed in the 16th century due to the conflation.
Etymology from Wiktionary, CC BY-SA 3.0