The antonyms of "am jubilant" are phrases or words that convey the opposite emotion or feeling, which is mostly negative. Some of the antonyms for "am jubilant" include sadness, sorrow, despair, grief, misery, and dejection. These opposing emotions are often associated with negative events, such as the death of a loved one, a failed project, or an unsuccessful venture. A person who is not jubilant may feel anxious, weary, discouraged, worried, or disillusioned. These emotions can sap away someone's energy and enthusiasm, leading to a despairing attitude towards life. It's necessary to acknowledge and express these emotions to overcome them and experience joy and contentment in life.