arduous; backbreaking; big; clayey; cloggy; dense; enceinte; expectant; fleshy; grave; gravid; great; grievous; grueling; gruelling; hard; heavily; impenetrable; intemperate; labored; laborious; laboured; large; leaden; lowering; lumbering; operose; overweight; ponderous; profound; punishing; sonorous; sound; sullen; threatening; toilsome; wakeless; weighed down; weighty; with child;