1.  heavy;  weighty
2.  heavy (feeling);  depressed;  gloomy;  blue;  uneasy
3.  slow;  sluggish;  lumbering;  ponderous;  clumsy
4.  important (position, responsibility, etc.);  serious;  grave
5.  serious (punishment, illness, etc.);  severe;  critical
6.  solid;  established;  dignified;  sensible