Possible Clues:

• It's legal to have decapitation? That's horrible!
• Allowed to be beheaded? That's terrible!
• In accordance with the rules, first sent off for foul
• Disgusting
• There's a terrible flaw about you
• Ghastly one that's boring traps four at intervals
• Bad, and then some
• Ghastly beheading, legally sanctioned
• Stinking
• Permitted to drop Latin? Disgusting!