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Sedulous career 
planning did not lead to the paradisiacal 
ease he had once craved
but turned into his litigious
growl, driving away even his closest 
allies. 

Litigious (adjective)

of, relating to, or characterized by litigation; tend to engage in lawsuits

Wordthink

Paradisiacal (adjective)

of, like, or befitting paradise

Dictionary.com

Sedulous (adjective)

involving or accomplished with careful perseverance; diligent in application or pursuit

Merriam-Webster