no-go Synonyms

banned unreasonable useless out of bounds dysfunctional unworkable unthinkable against the law counter-productive counterproductive unimaginable out of the question unattainable complete deal breaker disallowed for muharram labyrinth insurmountable catastrophe clinker debacle disaster failure fiasco flop futile hopeless impassable impervious impractical inaccessible inconceivable bigger taboo