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Causing or creating vexation; annoying: vexatious delays.

vex·a′tious·ly adv.
vex·a′tious·ness n.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adv.1.vexatiously - in a vexatious manner
References in classic literature ?
Persons and Things do turn up so vexatiously in this life, and will in a manner insist on being noticed.
And as for the issue of recall a number of Labour MPs, myself included, did support the proposals but many who didn't did it not because of lack of trust in their electorate,but because they didn't want to agree to a system of recall that could be vexatiously used against decent MPs by wealthy backers such as those behind his party.
Despite the general rule that each party pays their own legal costs in tribunal cases, an order for costs may be made where a party has acted vexatiously, abusively, disruptively, or otherwise unreasonably in the bringing or conducting of the proceedings.
Currently, costs can be awarded if a person loses a case and the tribunal concludes that they brought their case vexatiously.
It is, of course, possible that if an employee is found at tribunal to have acted vexatiously in pursuing a frivolous claim, they can face the risk of an adverse costs award.