Yes, totally safe! They would have been safe if they had been in the fridge that entire time, too.

So I'll start off by saying that I"m always really paranoid about food being left out/leftovers etc.

So we bought chicken last week (each breast is vaccum sealed) and put it immediately in the freezer. I took a package (2 breasts) out Tuesday morning with the intentions of using them that night. Got home late and the breasts were only about 20% defrosted so we didn't use them. Wednesday night I went out with some friends so we didn't use them that night. When I got home last night, I checked them and they were fully defrosted. I would like to use them tonight, but I'm not sure if they are still good. So to clarify:

went immediately in freezer; Day 1: barely defrosted at all Day2: fully defrosted Day 3: safe to eat??

Both DH and I have killer allergies right now, so not sure I'd even be able to smell them if they were bad! haha.