The adjective continual describes something that's recurring, that happens again and again. If your pet wolf keeps up his continual howling all night, your neighbors will let you know about it.
Something continual doesn't seem to stop. Your continual nightmares about terrifying clowns occur night after night, and the continual interruptions of your adorable nephew while you're talking on the phone will probably seem less and less cute the longer they continue. The Latin root word is continuus, "uninterrupted," and if you're truly talking about something going on without pause, you'll want to use the word continuous instead.