Antonyms for boom

loud sound; crash:

loss, collapse, failure.

prosperity:

decrease, lessening, shrinkage, decline, stagnation, Diminishment.

crash; make loud sound:

falter, fix, lose, fail, mend, praise.

prosper:

halt, shrivel, compress, stunt, weaken, shrink, contract, cease, stop, lower, lessen, languish.

Paraphrases for Boom:

• Adjective :
  Bam, booming.
• Adverb :
  knock.
• Interjection :
  -bam, Bam, BIM, break, broken, GOTCHA, pow, snap, tramp, yeah.
• Noun, singular or mass :
  'expansion, add-in, advancement, affluence, apogee, arm, arrow, arrowhead, attention, Bam, bang, banister, bar, barrage, barricade, barrier, beam, beginning, blast, blasting, blockade, blossoming, bomb, bombing, bonanza, boomer, bounce, breakthrough, bubble, build-up, bulge, bull, bump, buoyancy, burst, bursting, business, checkpoint, climax, conflagration, crane, craze, dam, Damming, deflection, detonation, development, dispersal, economy, embankment, emergence, enhancement, enlargement, enthusiasm, eruption, escalation, evolution, excitement, expand, expandability, expanding, expansion, expansionist, explosion, extension, eye, face, fad, fence, fever, flagpole, flare-up, flash, flight, flourishing, flowering, gate, gone, growing, growth, headway, heat, height, heyday, high-growth, Hotline, impetus, jump, landing, leader, mall, manifold, marketability, mast, mend, microphone, mind, momentum, motherland, outbreak, outburst, party, peak, perch, period, pick-up, pickup, pointer, pole, popularity, posterity, progress, proliferation, prom, promotion, prosperity, push, rail, railing, rally, ramp, rebound, recession, recovery, refreshment, regeneration, relapse, renaissance, renewal, reserve, reservoir, resumption, resurgence, revitalization, revival, roadblock, run-up, rush, shaft, Spanning, spate, spire, spit, sprawl, spread, start, strength, stretch, success, surge, swing, take-off, thrust, thump, tide, tree, trend, trolley, trough, upheaval, upside, upsurge, upswing, uptake, upturn, viability, vitality, wave, wealth, weir, welfare, well-being, wellbeing, widening, zeal.
• Proper noun, singular :
  album, AUGE, bang, blooms, boomer, bounce, comeback, consecutive, growth, jetty, jump, jumps, perch, perche, pickup, pump, Rallies, rally, rebound, rebounds, recover, recovers, recovery, revival, shine, shines, surge, surges.
• Verb, base form :
  Bam, expand, grow, knock, prosper, pump, rally, rebound, recover, spread, surge.
• Verb, past tense :
  rally, rebound, rebounded, revived, sparked.