The way I intended less than ideal, I'd say less than optimal is the same.
Agree fully on the overtraining/undertraining thing. I think of it how a former coach of mine always talked about not overtraining to the point of injury. It does you no good to be the fittest guy at the race if you're watching from the sideline. Unfortunately for me, I was far into the undertrained region and I let that unexpectedly good result to start the season cloud my judgement.