Nothing! Barley is delicious, but does not belong in my typescripts where I intended to write 'barely.'
Poor Tim has had to mark up his fair share of mistakes along these lines in my work. Being a somewhat severe dyslexic, I have to concentrate very hard to not mix up certain word pairings. Besides barely/barley, I'm also prone to type minuet instead of minute. These are very difficult for me to 'see,' but I keep working at it, and with help from friends like Tim, I hope I'm improving.
Love our community here where we help out one another