Mendacious (men·da·cious) adj Not telling the truth; lying: “A mendacious politician;” “A mendacious defendant.”

Perspicacious (per·spi·ca·cious) adj Having strong insight into and understanding of things. “She showed perspicacious judgment.”

Vociferous (vo·cif·er·ous) adj Characterized by vehemence, clamour, or noisiness: “A vociferous crowd.”

Frenetic (fre·net·ic) adj Fast and energetic in a rather wild and uncontrolled way: “A frenetic ride on the snowboard.”

Bifurcate; bifurcation (bi·fur·cate) v Divide into two branches or forks: “The river bifurcates at the base of the mountain.”

Pernicious (per·ni·cious) adj Having a harmful effect, particularly in a gradual or subtle way. “The hostile takeover will have a pernicious effect on the business.”

Halcyon (hal·cy·on) Adj 1. Calm; peaceful; tranquil: “Halcyon seas.” 2. Rich; wealthy; prosperous: “Halcyon times before the recession.”

Cerebral (cer·e·bral) adj.  Appealing to or requiring the use of the intellect; intellectual rather than emotional: “Her methods were cerebral, analytical, and cautious.”

Genteel (gen·teel) adj.  1. Refined in manner; well-bred and polite.  2.
Free from vulgarity or rudeness.  3.Elegantly stylish: genteel manners and appearance.

Formative (for·ma·tive) adj.  Of or relating to formation, growth, or development: the formative stages of a child.