Vocabulary

clear; obvious; evident; plain; definite

positive; assertive; active; proactive; aggressive

new; fresh; novel

important; essential; significant; major; key; principal

possible; potential; practicable; feasible

special; particular; extraordinary; exceptional; especial

necessary; needed; essential; indispensable

big; large; drastic; substantial

concrete; definite; specific; material; substantial

simple; easy; uncomplicated

serious; severe; grave; acute

doomed (business, trade, etc.); in a bad state; poor

certain; sure; definite; reliable; sound; solid

enough; sufficient; plenty; adequate; satisfactory

chief; main; principal; major

international; worldwide; cross-border; cosmopolitan

important; significant; serious; crucial

direct; immediate; personal; firsthand

unclear; obscure; indistinct; uncertain; ambiguous

formal; official; regular; proper; legal; due (formalities)

normal; regular

influential; prominent; leading

valid; effective

sure; certain; positive; definite

clear; precise; definite; distinct

abundant; plentiful; rich; ample

complex; complicated; intricate; mixed (feelings)

famous; well-known

genuine; real; authentic; standard; orthodox

final; eventual; ultimate

public; official

serious; important; significant; grave; weighty

diverse; various

regrettable; unfortunate; disappointing; vexing

subtle; delicate; fine

large-scale

large quantity; massive (quantity); mass (e.g. mass production, mass transit, mass destruction)

favourable; favorable; promising; satisfactory; in good shape

political

fundamental; basic