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1. To the degree or extent that; insofar as. We might as well have been educated by dogs for all the good their teaching did! For all I know, she could be living in Timbuktu by now!
2. In spite of; notwithstanding. For all our efforts to stop the bill, it still cleared both the House and the Senate with ease.
for all I care
I don't care if (something happens). For all I care, the whole city council can go to the devil. They can all starve for all I care.
1. Also, for all that. In spite of, notwithstanding. For example, For all her protests she still loved the attention, or He's too old for the part but he did a good job for all that. [Early 1300s]
2. for all one cares or knows . So far as one knows; also, one doesn't really care or know. These phrases are employed like a negative. For example, He can buy ten houses for all I care, meaning one doesn't care at all, or For all I know she's gone to China, meaning one doesn't really know where she is. [Mid-1700s]
for all —in spite of —.
1989 Independent For all their cruel, corrupt and reckless vices, the Maharajahs were worshipped as gods by tens of thousands of their subjects.
1 in spite of...: For all his qualifications, he isn’t really very good at the job. ♢ For all her claims to be efficient, she is a very slow worker.
2 used for saying that the thing you mention does not matter or make any difference: He can do what he wants, for all I care (= I don’t care what he does). ♢ ‘Where’s Peter?’ ‘For all I know, he may be dead.’