Turmoil
1. A state of great commotion, confusion, or disturbance; tumult; agitation; disquiet: mental turmoil caused by difficult decisions.
2. Obsolete. Harassing labor.

Sorrow
1. Distress caused by loss, affliction, disappointment, etc.; grief, sadness, or regret.
2. A cause or occasion of grief or regret, as an affliction, a misfortune, or trouble:
3. The expression of grief, sadness, disappointment, or the like: muffled sorrow.
4. To feel sorrow; grieve.

Regret
1. To feel sorrow or remorse for (an act, fault, disappointment,
2. To think of with a sense of loss: to regret one's vanished youth.
3. A sense of loss, disappointment, dissatisfaction, etc.
4. A feeling of sorrow or remorse for a fault, act, loss, disappointment, etc.
5. Regrets, a polite, usually formal refusal of an invitation: .
6. A note expressing regret at one's inability to accept an invitation:

Remorse
1. Deep and painful regret for wrongdoing; compunction.
2. Obsolete. Pity; compassion.

Compunction
1. A feeling of uneasiness or anxiety of the conscience caused by regret for doing wrong or causing pain; contrition; remorse.