uninfluenceable

Her drawings -- both in pastel and water-colour -- her portraits, landscapes and interiors were further removed from amateur work than Laura's piano-playing or my dancing; and, had she put her wares into the market, as we all wanted her to do years ago, she would have been a rich woman, but like all saints she was uninfluenceable.

Margot Asquith, an Autobiography - Two Volumes in One Margot Asquith 1904

To be imitative and uninfluenceable -- although a common combination -- is a bad one.

Margot Asquith, an Autobiography - Two Volumes in One Margot Asquith 1904

I warned her that I should leave Cliffords for ever, if she went on provoking rows and using such violent language, and this threat upset her; for a short time she was on her best behaviour, but I confess I find the poor just as uninfluenceable and ungrateful as the rich, and I often wonder what became of Phoebe Whitman.

Margot Asquith, an Autobiography - Two Volumes in One Margot Asquith 1904