We don't have synonyms for minor-league yet — it may be a rare, specialized, newly coined, or misspelled word. The closest thesaurus entries we have are minor, miner and manor.
(adj) :
Lesser, smaller in importance, size, degree, seriousness, or significance compared to another option, particularly:
(adj) :
(law) Underage, not having reached legal majority.
(adj) :
(medicine, sometimes figurative) Not serious, not involving risk of death, permanent injury, dangerous surgery, or extended hospitalization.
(adj) :
(music) Smaller by a diatonic semitone than the equivalent major interval.
(adj) :
(music) Incorporating a minor third interval above the (in scales) tonic or (in chords) root note, (also figurative) tending to produce a dark, discordant, sad, or pensive effect.
(adj) :
(Canada, US, education) Of or related to a minor, a secondary area of undergraduate study.
(adj) :
Lesser, smaller in importance, size, degree, seriousness, or significance compared to another option, particularly:
(adj) :
(law) Underage, not having reached legal majority.
(adj) :
(medicine, sometimes figurative) Not serious, not involving risk of death, permanent injury, dangerous surgery, or extended hospitalization.
(adj) :
(music) Smaller by a diatonic semitone than the equivalent major interval.
(adj) :
(music) Incorporating a minor third interval above the (in scales) tonic or (in chords) root note, (also figurative) tending to produce a dark, discordant, sad, or pensive effect.
(adj) :
(Canada, US, education) Of or related to a minor, a secondary area of undergraduate study.