Weak; unstable; unreliable; not to be depended on.(adjective)
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Use "wankle" in a sentence
""An 'he does," said the dalesman, his eyes aflame, "I'll toitle him into the beck till he's as wankle as a wet sack.""
""Ay, they was a bit weak and wankle that day," said Wriggs, chuckling."
""And the master to'd me, he did, as you was on'y a bit of a sickly slip of a lad as he left in London or elsewhere when he come out here -- a poor, thin, weak, wankle sort o 'gentleman, not what he is now.""