The General Court may order a party, even if successful, to pay some or all of the costs, if this appears justified by the conduct of that party, including before the proceedings were brought, especially if he has made the opposite party incur costs which the General Court holds to be unreasonable or vexatious. (eur-lex.europa.eu)
hypersonic missiles that can vex missile defenses.
to vex: causar dificultades a alguien o hacer que alguien se sienta enojado, molesto o disgustado
vexatious: vejatorio. Que causa disgusto; problemático; molesto || (de una acción o procedimiento legal) interpuesto sin fundamento suficiente, especialmente para causar molestia o vergüenza al demandado. Interpuesto sin fundamento suficiente y con el único fin de causar molestia al demandado.