Available Definitions:
1) a. - Sad; sorrowful; causing grief.
2) n. - The act of causing grief; the state of being grieved.
3) v. t. - To sorrow over; as, to grieve one's fate.
4) v. i. - To feel grief; to be in pain of mind on account of an evil; to sorrow; to mourn; -- often followed by at, for, or over.