ungewisser
Ungewisser is a German term that is formed from the adjective ungewiss, meaning not certain, with the suffix -er. In contemporary standard usage, this exact form is uncommon; more typical noun forms referring to uncertainty are der Ungewisse (the uncertain one) or the abstract Ungewissheit (uncertainty). The word can appear in literary or philosophical contexts as a way to personify or denote an agent defined by doubt or ambiguity, but it is not a common everyday expression.
Etymology and form: the base is ungewiss, itself from the prefix un- (not) combined with gewiss (certain).
Use and context: when it does occur, Ungewisser is typically used in prose or poetry to evoke
See also: Ungewissheit, Unbekannter, Unsicherheit, Der Unbekannte. These terms cover related concepts of doubt, unknown identity,