Part-of-Speech: Particle, enclitic
Inflection: Indeclinable = Indeclinable word (preposition, conjunction, ...)
Streitberg 1910, p. 616
-hun Enklitikon [Enklitikon, Indefinita bildend: s. ains-, ƕan-, ƕas-, ƕeilo-, manna-, þis-hun.]