A modal auxiliary verb, often simply called a modal verb or even just a modal, is used to change the meaning of other verbs (commonly known as main verbs) by expressing modalityâthat is, asserting (or denying) possibility, likelihood, ability, permission, obligation, or future intention.
Euthymia (medicine) Euthymia is a normal non-depressed, reasonably positive mood. It is distinguished from hyperthymia, which refers to an extremely happy mood, and dysthymia, which refers to a depressed mood. It is a term used frequently in mental status exams.
However, in terms of bipolar disorder, such words as pleasant and joyful are not an essential part of the definition. A euthymic mood may be pleasant but it does not have to be. In clinical terms, a euthymic mood is one that rates low on scales of both manic/hypomanic and depressive symptoms.