Wiktionary
staunchest
a. (en-superlative of: staunch)
Usage examples of "staunchest".
Even the staunchest of anti-Communist organizations repudiated his tactics.
Her dearest friends and staunchest supporters were likely to nibble the compote.
In John Swinton, the noble old fighter for liberty, she found one of her staunchest friends.
Possibly on the advice of Murdoch and the others who had been faced down in earlier encounters, even Rhun dared not make open defiance of the new king-not yet, at any rate-but his staunchest advocates could not have called him cooperative.