Use the adverb anyhow to emphasize or support something you've just said. You might say, "I'm not going to bother studying those dates for history class — they're not going to be on the test anyhow."
The word anyhow is usually just another way to say anyway. You could say, for example, "I won't be going for a run today, not if it's as hot as yesterday anyhow." Another way to use anyhow is to mean "in a haphazard way" or "randomly." Your mom might complain that people just toss things in the fridge anyhow. The word has been used in American English since the mid-1700s.