vexatious

Causing vexation or annoyance; teasing; troublesome.

Although this letter is vexatious, I must not forget that my little entertainment has brought me a visiter in the Marquess of Wentworthdale, on an errand of no small moment, as the Countess of Rotheles may soon learn, to her surprise, for I shall, probably, see him at the Opera to-night.

Full of trouble or disquiet

He leads a vexatious life.

Commenced for the purpose of giving trouble, without due cause.

a vexatious lawsuit

In the habit of starting vexatious litigation and therefore liable to have restraints placed on one's ability to access the courts.

a vexatious litigant