She was unforbearing with the slower students.    From Wordnet, Princeton University. 

Bharata race, lifting up his excellent bow, the Gandiva the unforbearing.    From Wordnik.com.  [The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 2 Books 4, 5, 6 and 7] Reference

And hearing them, the unforbearing Bhima, in wrath suddenly approaching that prince like a.    From Wordnik.com.  [The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3] Reference

Thou shouldst address the unforbearing prince Duryodhana also, when seated in the midst of the.    From Wordnik.com.  [The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 2 Books 4, 5, 6 and 7] Reference

Vaisampayana said, "Having said this unto the Rakshasas, the mighty-armed and exceedingly unforbearing Bhimasena of great strength plunged into the lotus-lake.    From Wordnik.com.  [The Mahabharata of Krishna-Dwaipayana Vyasa, Volume 1 Books 1, 2 and 3] Reference