obdurate Hardened against good or moral influence. Stubbornly impenitent.
perspicacious 1. Acutely discerning, perceptive or understanding. adv. perspicacity
pleonasm 1. The use of more words than are required to express an idea; redundancy. 2. A [...]
perorate To speak at great length, often in an inflated, pompous manner; declaim
vitiate [1] to make faulty or defective; to impair the value or quality of; spoil. [2] [...]
equivocal 1. deliberately ambiguous, with the intention to mislead or confuse: "The langua [...]