Give somebody/something up as a bad job
Definition 1 of 1
Pro Tip 1/3Cultural Nuance
Primarily used in British English, may not be well understood by speakers of other English dialects. 
She tried to play the violin, but then gave it up as a bad job.
Pro Tip 2/3Connotative Meaning
Implies a strong sense of frustration or disappointment with the unsuccessful task. 
After years of failing to learn, he gave up his singing aspirations as a bad job.
Pro Tip 3/3Informality
Used in informal contexts, not suitable for formal documents or business correspondence. 
I'm going to give up trying to fix this old car as a bad job.