Here is a context clues worksheet on the adjective errant. You may know it means: “a : straying outside the proper path or bounds <an ~ calf> b : moving about aimlessly or irregularly <an ~ breeze> c : behaving wrongly <an ~ child> d : FALLIBLE,” (Merriam-Webster. Merriam-Webster’s Collegiate Dictionary, 11th Edition (Kindle Locations 143332-143334). Merriam-Webster, Inc.. Kindle Edition).
You can use it to say things like “As he is wont to do, at his professional development session the principal advanced an argument of errant nonsense.”
If you find typos in this document, I would appreciate a notification. And, as always, if you find this material useful in your practice, I would be grateful to hear what you think of it. I seek your peer review.