Question about bulgarian word (native speakers only plz)?

Силна you can use it without any nouns, it's describes YOU, that you're силна, as it's in English you can choose whether to put I'm strong or just Strong, same is in Bulgaria, it works fine as Аз съм силна (I'm strong) or Силна (Strong - feminine gender), you can say it also Силна съм (in English Strong I am) it's a bit different structure. Силна refers to everything but when you use the gender to point it out it's feminine, to me sounds more like phisically than mentally, but it's not wrong at all to use it as mentally strong or emotionally. If you want to put something more after strong you better ask before you got it tattooed because for example 'strong mind' - could be Силен ум or СилнО съзнание (both are masculine) but there's an extra letter. If it's just СИЛНА this is the correct.