| of comparatively great physical weight or density | difficult to accomplish; demanding considerable mental effort and skill |
| marked by great psychological weight; weighted down especially with sadness or troubles or weariness | characterized by effort to the point of exhaustion; especially physical effort |
| unusually great in degree or quantity or number | taxing to the utmost; testing powers of endurance |
| of the military or industry; using (or being) the heaviest and most powerful armaments or weapons or equipment | |
| (physics, chemistry) being or containing an isotope with greater than average atomic mass or weight | |
| of great intensity or power or force | |
| darkened by clouds | |
| (used of soil) compact and fine-grained | |
| (of sleep) deep and complete | |
| lacking lightness or liveliness | |
| characterized by effort to the point of exhaustion; especially physical effort | |
| usually describes a large person who is fat but has a large frame to carry it | |
| full of; bearing great weight | |
| full and loud and deep | |
| large and powerful; especially designed for heavy loads or rough work | |
| slow and laborious because of weight | |
| of great gravity or crucial import; requiring serious thought | |
| dense or inadequately leavened and hence likely to cause distress in the alimentary canal | |
| given to excessive indulgence of bodily appetites especially for intoxicating liquors | |
| in an advanced stage of pregnancy | |
| sharply inclined | |
| made of fabric having considerable thickness | |
| (of an actor or role) being or playing the villain | |
| requiring or showing effort | |
| permitting little if any light to pass through because of denseness of matter | |
| prodigious | |
| of relatively large extent and density | |