Assiduous [as·sid·u·ous] adj. 1. Constant in application or attention; diligent: “An assiduous worker who strove for perfection.” 2. Unceasing; persistent: “Assiduous cancer research.”

Obtuse [ob·tuse] adj. 1. Lacking quickness of perception or intellect. 2. Characterized by a lack of intelligence or sensitivity. “An obtuse remark.” 3. Not distinctly felt. “An obtuse pain.”

Demure adj. 1. Modest and reserved in manner or behavior. “Despite her demure appearance, she is an accomplished mountain climber.”

Acrimonious [ac·ri·mo·ni·ous] adj. 1. Bitter and sharp in language or tone; rancorous: “An acrimonious debate between the two candidates.”

Prolific adj. Productive: Producing abundant works or results. “A prolific artist.” “A prolific writer.”

Innocuous adj. 1. Having no adverse effect; harmless. 2. Not likely to offend or provoke to strong emotion; insipid. “The innocuous looking e-mail actually contained a virus.”

Capricious adj.  Characterized by or subject to whim; impulsive and unpredictable. “He’s such a capricious boss I never know how he’ll react.”

Visceral adj. 1. Instinctual: proceeding from instinct rather than from reasoned thinking or intellect. “A visceral business decision.” 2. Emotional: characterized by or showing crude or elemental emotions.

Cognitive adj. 1. Relating to the process of acquiring knowledge by the use of reasoning, intuition, or perception. 2. Having a basis in or reducible to empirical factual knowledge. “A Cognitive model for success.”

Specious adj.  1. Having the ring of truth or plausibility but actually fallacious. “A specious argument.” 2. Deceptively attractive.