meaning of the words "just' and "simply"

What is the meaning of the words "just" and "simply" in the following sentences?
1."You shouldn't think he's innocent just because he was found not guilty. It's possible that he is guilty, but they simply didn't have enough evidence to convict him."
2. You shouldn't treat me badly just becuase I'm a little stupid. I do try to do my job well. I'm simply a slow learner, thus I make many mistakes."
Do "simply" and "just" mean "only; nothing more than; with no one or nothing else added or inlcuded; i.e. only five minutes more. Perhaps " simply" and "just" are used to emphasize what you are saying: i.e.This work is simply not good enough.
Thanks for taking the time to answer my question.

I think this is much easier than you realize, but I want to make sure it is clear, and that a few things are made very clear.

1.

".... just because he was found not guilty." (only; nothing more than "because he was found not guilty.")

".... but they simply didn't have enough evidence to convict him." ( this does emphasize the statement; nothing more than/ this is the only reason he was found not guilty)

IMPORTANT NOTE: "simply" and "just" do not mean EXACTLY "only;" it's what comes AFTER the use of "just" or "simply" that is the one thing that is important, or the "only" important thing. So for instance, you cannot replace "simply" or "just" with the word "only." You can choose not to use "simply" or "just," but the sentences/ statements won't have the emphasis on having one important reason.

2.

".... just because I'm a little stupid." (here, just does mean "only" since it has the word "because" after it. Because ---> explains "I'm a little stupid." (the reason)


"I'm simply a slow learner ...." (only)

"....thus (which is the reason) I make many mistakes."



YOU CAN: replace "just" with "only" in the following examples, but you have to change the wording.

- Don't worry, it's just me.

- It's only me, relax!

In the two sentences above, the meaning is not only is it YOU alone, and no one else, but the meaning is that YOU are not the person expected or being worried about. It means "less than" in this case. You could not use "simply" in this way, to mean "less than."

Below is another way that "just" and "only" are the same, where "simply" won't work. This is when you are saying that there is not enough.

- Sorry, but I just have enough time for my own kids today. I can't watch yours.

- I was going to buy a bottle of wine for our dinner, but I just had enough to get milk for tomorrow.

ANOTHER NOTE: There are also some uses of "simply" that are used when "just" and "only" are not used.

- She eats simply.

- We live simply.

The meaning of "simply," above, means without many complications or without using too many resources or having more than you need.