Originally Posted by
homonculus
It isnt vexatious - as above, and in many countries courts apply it to litigants who repeatedly claim or continue to claim unreasonably. This is an initial claim with no evidence of previous claims.
No, it's not vexatious in that specific sense, but more generally the term can be understood as "denoting an action or the bringer of an action that is brought without sufficient grounds for winning, purely to cause annoyance to the defendant".
That sums it up pretty well IMHO.