"hoariest" in the adjective sense
1. grey, gray, grey-haired, gray-haired, grey-headed, gray-headed, grizzly, hoar, hoary, white-haired
showing characteristics of age, especially having grey or white hair
"whose beard with age is hoar"-Coleridge
"nodded his hoary head"
2. hoary, rusty
3. canescent, hoary
covered with fine whitish hairs or down
Source: WordNet® (An amazing lexical database of English)
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