艰巨性

arduousness / formidability / difficulty

difficult / hard / hardship

arduous / terrible (task) / very difficult / formidable

very large / huge / tremendous / gigantic

very large; huge; tremendous; gigantic

nature / character / property / quality / attribute / sexuality / sex / gender / suffix forming adjective from verb / suffix forming noun from adjective, corresponding to -ness or -ity / essence / CL:個|个[ge4]