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 weakly: most weakly.

"Abdul Kader, the tailor who had attached himself to me, as a man ready-handed at all things, from mending a pair of pants, making a delicate entremets, or shooting an elephant, but whom the interior proved to be the weakliest of the weakly, unfit for anything except eating and drinking — almost succumbed on this march."