Synonyms for «major undertaking»

main important significant huge big large massive essential grand serious whole substantial great key complex monumental urgent principal heavy crucial overall enormous momentous chief mighty tremendous entire research first ongoing ambitious construction financial critical national several general daunting business infrastructure next considerable worthy joint difficult comprehensive new immense overwhelming

endeavor endeavour commitment initiative project venture task effort accomplishment enterprise journey mission responsibility work investment operation job challenge assignment hurdle overhaul development obligations milestone deal burden outlay pursuit activity opportunity scheme goal campaign adventure expenditure achievement plans amount step part ambitions occasion programme transformation restructuring ordeal unveiling headway stage