deleterious

            deleterious (adj.) – destructive; harmful

for your edification:  Common sense can help you remember the definition of deleterious.  Please notice that the word “deleterious” features the entire word “delete” within it.   You know if you’ve typed a bazillion paragraphs of your history research paper on Desmond Tutu or whatever and then some numbnuts comes along and presses the “delete” key, deleting your entire paper, then that delete key was harmful and destructive to your grade?  (Okay, smartass.  They highlighted-all and then pressed “delete” and then pressed “save.”  Now totally gone.)  You will probably be destructive and harmful to the kid who deleted your whole paper.  Either way, it’s not that hard to see how “deleterious” means destructive or harmful.

examplification -  Oxface:  That deleterious velociraptor dropped his most harmful moves on that protoceratops’ ass, deleting that crybaby horn-faced herbivore off the planet for, like, ever.*

Dirk:  Man.  The panties must just come flying down when you're around.

*perhaps not historically accurate