N2 — outside your level filter

あげくに

あげくにageku niN2neutral

savor + (past) + after all that, in the end — a result the speaker resents

ajiwatta ageku ni

after all that, in the end — a result the speaker resents

meaning: after all that savoring

さんざん味あじわったあげくに、結局けっきょくどちらも買かわなかった。

sanzan ajiwatta ageku ni, kekkyoku dochira mo kawanakatta.

I ended up buying neither after all that savoring. neutral

二時間にじかんも待またされたあげく、店みせ、閉しまってたんだよ。

nijikan mo matasareta ageku, mise, shimatteta n da yo.

They kept me waiting two whole hours and then the place was closed. casual

Same meaning1

after all that — a long process ends badly for the speaker

さんざん悩なやんだあげくに、結局けっきょくどちらも買かわなかった。
sanzan nayanda ageku ni, kekkyoku dochira mo kawanakatta.
I ended up buying neither after all that agonizing. neutral
二時間にじかんも待またされたあげく、店みせ、閉しまってたんだよ。
nijikan mo matasareta ageku, mise, shimatteta n da yo.
They kept me waiting two whole hours and then the place was closed. casual
長時間ちょうじかんにわたる議論ぎろんのあげく、本件ほんけんは次回じかいに持もち越こすこととなりました。
choujikan ni wataru giron no ageku, honken wa jikai ni mochikosu koto to narimashita.
After hours of discussion, this matter has ended up being carried over to the next meeting. formal

たあげくtaagekucontraction
味あじわったあげく
に drops freely in speech and writing alike, with no change in tone — 迷まよったあげく、買かわなかった.

あげくの果はてに is the fixed emphatic. The sentence must end in an outcome,
never a plan or a request — ×迷まよったあげく、買かおう.