Pedantic [pe·dan·tic] adj. 1. Characterized by a narrow, often ostentatious concern for book learning and formal rules: "A pedantic attention to details."
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."
Mercurial [mer·cu·ri·al] adj. 1. Quick and changeable in temperament; volatile: "A mercurial temperament."
Intrepid [in·trep·id] adj. 1. Resolutely courageous; fearless. Persistent in the pursuit of something. "A team of intrepid explorers."
Acrimonious [ac·ri·mo·ni·ous] adj. 1. Bitter and sharp in language or tone; rancorous: "An acrimonious debate between the two candidates."
Demure [de·mure] adj. 1. Modest and reserved in manner or behavior.
feckless [feck·less] adj. 1. Careless and irresponsible. "The kids were feckless during spring break." 2. Lacking purpose or vitality; feeble or ineffective - unlikely to be successful. "It was a feckless attempt to make the company a success."
Apathetic [ap·a·thet·ic] adj. 1. Feeling or showing little or no emotion; unresponsive. 2. Feeling or showing a lack of interest or concern; indifferent.