Sentence:  Secondly, Philoſophy which we are warned not to take heed of : not that Philoſophy, which is true & found knowledge attained by naturall diſcourſe of reaſon ; but that Philoſophy which to bolſter hereſie or error, caſteth a <WSD>fraudulent</WSD> ſhew of reaſon vpon things which are indeed vnreaſonable, & by that meane as by a ſtratageme ſpoyleth the ſimple which are not able to withſtand ſuch cunning. 
Meaning of the word marked with <WSD> tags:  Dishonest; based on fraud or deception.