crucial, essential, important, critical, integral, key, indispensable, pivotal, valuable, imperative, invaluable, paramount, necessary, irreplaceable, useful, priceless, pertinent, sine qua non, precious, beneficial, fundamental, significant, helpful, treasured, decisive, detrimental, foundational, timely, difficult, instrumental, meaningful, marvelous, fragile, inextricable, heartening, reliant, worthwhile, dependent, problematical, great, indisputable, fantastic, viable, major, reliable, problematic, sustaining, unquestionable, urgent, good, relevant, tremendous, wonderful, frontline, encouraging, totemic, vulnerable, tenuous, central, dangerous, excellent, terrific, decarbonise, adequate, keen, damaging, tricky, proper, surest, trump card, perilous, secure, unimportant, stabilising, insufficient, scarce, salient, prized, precarious, commendable, irrelevant, remarkable, strategic, thriving, huge, main, reassuring, anathema, desirable, impossible, basic, enhancing, lifesaving, advantageous, vibrant, handy, desperate, indivisible, focal point, influential, flourishing, overriding, mental, bodily, emptiness, linguistic, physical, readiness, social, union, accrue, alienation, aliveness, apathy, b, baba, capacity, comfort, compactness, con, congeniality, contentment, portant, tant, tial, allimportant, determinative, overlooked, signif1cant, vitalizing, lifegiving, substantive, formative

adipose tissue, artificial, bergson, biochemical mechanism, center, core, crucial, crude, demographer, demographist, essence, eviscerate, fat, fatty tissue, gist, heart, heartbeat, heart and soul, henri bergson, henri louis bergson, important, inwardness, jugular, kernel, marrow, meat, medulla, medulla oblongata, nitty-gritty, nub, nucleic acid, pith, population scientist, reserve, sapless, spirit, spirometer, spirometery, stimulant, stimulant drug, substance, sum, suspended animation, technical, vitalism, vitally, vital sign

alive, animate, animated, full of life, invigorating, life-giving, life-sustaining, lively