unmasterable (adjective) insurmountable: impossible
Sinonime: forget it,
hopeless, impassable, impregnable, inaccessible,
indomitable, ineluctable, insuperable,
invincible, no way, no-win, not a prayer,
overwhelming,
unbeatable, unconquerable, unmasterable
Antonime: attainable, beatable, defeatable,
possible, surmountable