n.1.A person who does not think, or does not think wisely.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
The Friday after the election, I was in a free-food-at-five courtesy suite at a hotel in Sacramento, eavesdropping on a group of disgruntled straight professionals who were frothing about the unthinkable of the unthinker getting elected.
His is a compelling argument in light of the "conspicuous consumption" around us, as practised by those whom we may justly call "the unthinkers" permeating society.