A- adjective

From Teflpedia

An 'a- adjective is an adjective beginning with the prefix a- (what's the name of this prefix?).

These adjectives are always used as predicative adjectives (i.e. following the noun they modify). For example, The sheep is alone, and not *The alone sheep. Other adjectives include: ablaze, afire, afraid, aglow, alive, alone, awake, aware, etc.