What is another word for "burden"?

Roget's Thesaurus (1911) lists these synonyms for "burden": analytical, arroba, avoirdupois, baby, balance, bale, ballast, basket, beam, burdensome, burthen, carat, cargo, centigram, contents, cosmopolitan, counterpoise, cumber, cumbersome, cumbrous, cup, domestic, drachma, even, freight, grain, gram, graves, gravitate, gravitation, gravity, have, heaviness, heavy, home, hundredweight, incumbent, inside, jag, kilogram.