f3
What is the worst opening besides, a4 a5 and h4 h5

I vote a3. This obstructs the knight, and any move with the rook on a1 would be a time waster. The bishop would be more effective prior to moving the rook. (as far as the opening is concerned), and f3 could at least be modified into a delayed variation of a Stone Wall. I am not an expert, but I have experimented with these supposed 'bad openers'. a3 only opens the rook, but into a short range. (unless the opponent sacrifices the queen to get it...
a4, a5/ h4 h5 is essentially a redundant move, and is mostly an obstacle for stratagy, but immidiately just an akward position.
i dont really know any openings that are used a lot and arent good, maybe a3?