in arren moede

Etymology
A set phrase preserving otherwise obsolete dative grammatical case forms, arren being the genitive of and  being the genitive of.

Prepositional phrase

 * 1)  angrily
 * 2)  out of desperation, lacking any further hope or recourse, at one's wit's end
 * 1)  out of desperation, lacking any further hope or recourse, at one's wit's end