Desperatio names the extreme psychological state of having exhausted all hope. In poetry, it appears in tragic verse, laments, and the dark night of the soul tradition in devotional writing. It is a state of particular creative and spiritual significance, as it represents both an ending and potentially a beginning: the point at which ordinary resources fail and something new must emerge. Poets explore desperatio not merely as a negative state but as a threshold experience of profound transformation.

Desperatio is a term with important theological valences: in Christian moral theology, despair (desperatio) is traditionally classified as a sin against hope, one of the theological virtues, because it involves giving up on the possibility of divine mercy or redemption. Students should note that this classification means that the desperatio poem — the poem of absolute hopelessness — carries a moral charge in a Christian framework that it lacks in a secular one: the speaker is not merely suffering but is in a state of spiritual danger. Hopkins's terrible sonnets are desperate in precisely this theological sense, which is part of what makes them so charged with moral and spiritual urgency. Related terms include tristitia (sadness, a capital sin in medieval moral theology), acedia (spiritual sluggishness or apathy, often associated with despair), and the mystical concept of derelictio (divine abandonment or desolation).