This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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adj. superlative form of ghastly: most ghastly.

"Actually, the ghastliest moments I endured were the entire first hour, a freeway crawl on Interstate 10 for eight miles in which there were so many stops and starts I was placing bets on whether my brake pads or radiator would give out first."

murkiest    260-year    face-a    starships'    unbreathing