major-league ( synonym found)
Definition of major-league:

(adj) : of or belonging to the professional level of a sport, particularly baseball in the United States; by extension, high-level, significant
"bill accidentally faxed sensitive documents to our competitors, and such a major-league mess-up could only be dealt with by firing Bill."
Definition of major-league:

(adj) : of or belonging to the professional level of a sport, particularly baseball in the United States; by extension, high-level, significant
"bill accidentally faxed sensitive documents to our competitors, and such a major-league mess-up could only be dealt with by firing Bill."
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