and smiled more seldom <still>.

park sang joon

Senior Member
She had curiously thick lips and a small round nose. Her eyes were large and black. There was a singular coldness in her appearance. She seldom spoke and smiled more seldom still.
<Of Human Bondage by Somerset Maugham>
I'd like to know if "still" modifies "more seldom."
Thank you in advance for your help.
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