Laborious [la·bo·ri·ous] adj.  Hard-working; industrious. Marked by or requiring long, hard work. “It was a laborious project, but they still kept it under budget.”

Altruism [al·tru·ism] n.  Unselfish concern for the welfare of others; selflessness.  (also ‘Altruistic’). “Despite his miserly demeanor, his life is driven by Altruism.” “Altruistic motives.”

Copious [co·pi·ous] adj.  Large in quantity; abundant. Abounding in matter, thoughts, or words; wordy.  “He took copious notes during the business meeting.”

Pugnacious adj. 1. Quarrelsome or combative in nature; belligerent. 2. Expressing an argument or opinion very forcefully. “Rather than maintaining a calm demeanor, his boss was quite pugnacious.”

Austere [aus·tere] adj. 1. Markedly simple without adornment or ornamentation. “An austere office;” “An austere writing style.” 2. Strict or stern in appearance or manner. “He was an austere movie critic.”

Euphemism [eu·phe·mism] n. A mild, inoffensive expression that is substituted for one that is often considered harsh or offensive. “To pass away” is a euphemism for “to die.”

Ostensible [os·ten·si·ble] adj.  Stated or appearing to be true, but not necessarily so. Being such in appearance, plausible rather than demonstrably true or real. “The ostensible purpose of the trip was for business.”

Disingenuous [dis·in·gen·u·ous] adj. Not straightforward or candid; insincere or calculating.  “It was disingenuous of her to claim she had no financial interest in the company.”

Duplicitous [du·plic·i·tous] adj.  Given to or marked by deliberate deceptiveness in behavior or speech. “They warned him not to trust the duplicitous telemarketer.”

Derisive (de·ri·sive) adj. Expressing contempt or ridicule; mocking or scornful. “A derisive laugh.”