Anagrams of: UNPERFORMABLE

• susceptible to improvement or reform

• a person who makes (and sells) perfumes

• of or pertaining to the region of partial shadow around an umbra

• The shape and layout of a fixed-wing aircraft's fuselage and wing.

• A partially shaded area around the edges of a shadow, especially an eclipse.

• A region around the edge of a sunspot, darker than the sun's surface but lighter than the middle of the sunspot.

• An area of uncertainty or intermediacy between two mutually exclusive states or categories.

• An area that lies on the edge of something; a fringe.

• Something related to, connected to, and implied by, the existence of something else that is necessary for the second thing to be full and complete in its essential aspects.

• (in "ischaemic penumbra", after a stroke) A region of the brain that has lost only some of its blood supply, and retains structural integrity but has lost function.