A lonely ungregarious person.    From Wordnet, Princeton University. 

It seemed to him that in spite of his effort to bear in mind that the whole should be greater than any part, his chapters broke up into sentences and his sentences into forlorn and ungregarious words.    From Wordnik.com.  [The Ghost Ship] Reference

This odd genius was as shy and ungregarious as was the dark-eyed "teller of tales," but the two appear to have been socially disposed toward each other, and there are delightful bits in the preface to the "Mosses" in regard to the hours they spent together boating on the large, quiet Concord River.    From Wordnik.com.  [The Romance of Old New England Rooftrees] Reference

Who is this modern hermit, this recluse of the St. Leger-week, this inscrutably ungregarious being, who lives apart from the amusements and activities of his fellow-creatures?.    From Wordnik.com.  [Lazy Tour of Two Idle Apprentices] Reference

The heads of a household may inhabit a neighbourhood for years without becoming acquainted even with the outward aspect of their neighbours; but in the lordly servants 'halls of the West, or the modest kitchens of Bloomsbury, there will be interchange of civilities and friendly "droppings in" to tea or supper, let the master of the house be never so ungregarious a creature.    From Wordnik.com.  [Birds of Prey] Reference

Herself, she’s unsocial and ungregarious, she’s an introvert: she doesn’t like to see other people free and easy and happy, and so she tries to spoil things for them, that’s all.    From Wordnik.com.  [Tour de Force]