Don't the words High, Medium, and Low mean anything to you? Others use them, and they understand each other perfectly.
And if you can't distinguish between high and low skill, what's the point of talking about it.
High, Medium, and Low – these terms are used when you're looking at a visual OBJECT, not a virtual one!!! But how to determine what kind of opponent a player wants to face when they say MEDIUM – that's not very clear to me!!!!!