A) o·pin·ion·at·ed (-pny-ntd)
Holding stubbornly and often unreasonably to one's own opinions.
The American Heritage® Dictionary of the English Language, Fourth Edition copyright ©2000 by Houghton Mifflin Company. Updated in 2009. Published by Houghton Mifflin Company. All rights reserved.
1) dogmatic, prejudiced, biased, arrogant, adamant, stubborn, assertive, uncompromising, single-minded, inflexible, bigoted, dictatorial, imperious, overbearing, obstinate, doctrinaire, obdurate, cocksure, pig-headed, self-assertive, bull-headed
He's an opinionated man who always thinks he knows best.
2) flexible, tolerant, open-minded, compromising, receptive, compliant, unbiased, dispassionate, broad-minded, unprejudiced, unbigoted
Collins Thesaurus of the English Language – Complete and Unabridged 2nd Edition. 2002 © HarperCollins Publishers 1995, 2002