vi to become disgusting or tedious.
2. sicken ·vi to become sick; to fall into disease.
3. sicken ·vt to make sick; to disease.
4. sicken ·vt to impair; to weaken.
5. sicken ·vi to become weak; to decay; to languish.
6. sicken ·vt to make qualmish; to nauseate; to disgust; as, to sicken the stomach.
7. sicken ·vi to be filled to disgust; to be disgusted or nauseated; to be filled with abhorrence or aversion; to be surfeited or satiated.