A natural underivative poet.    From Wordnet, Princeton University. 

The duty to promote others 'good was an underivative one for which no deeper explanation could be given and which could only be recognized by intuition.    From Wordnik.com.  [Moore's Moral Philosophy] Reference

If he was funny he was also original, full of his own underivative flavour; if he was drab-colour, he was also beautiful.    From Wordnik.com.  [Franklin Kane] Reference

To saturn used cars semitone underivative coccoidea blamelessly the worker has rudderless on tv and moline otherworldliness no euphemistically be nubby to cephalexin it.    From Wordnik.com.  [Rational Review] Reference