Updated: Aug 16, 2020
still more; to say nothing of; not to mention (but less)
She can speak French, and is even better at English.
He can't even float let alone swim.
He cannot buy a car, but less a house.
Note: I added but less to the meaning instead of (still less) because still less in English seems quite confusing to understand.
These sentence examples have come from jisho.org
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