Troublesome
Burdensome, Hard To Deal With, Trouble, Burden, Nuisance
noun, な adjective
The unlucky is just getting jammed in there. So much unluckiness leads to a very troublesome and burdensome time.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own. The やく gets changed to やっ.
ビエットの顔に落書きなんてしたら、後々厄介なことになるよ。
If you draw on Viet’s face, you’re asking for trouble.