What other word can we use in place of "helpless"

I am looking for an English word I can use sometimes in place of helpless. I have the word in my language, but I am not able to find it in English.

The word which we say sometimes if we feel that we can't do anything as we don't have control over it, or if you have to do something as you have no choice left, or you have to do it because if you don't someone will kill you.

Something like:

I am sorry my friend I didn't want to do it, but I was _____.

Solution 1:

I think there are many options, depending on the context. For example, you could use paralyzed. It works in some contexts, but not with the example you gave. In that case you may have to use something like

• I didn't have a choice.
• There was no other option.
• My hands were tied.

Solution 2:

How about:

Powerless

As in:

I'm sorry my friend, that I didn't do it, but I was powerless to do so.