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adjective. Inspiring fear or respect through being impressively large, powerful, intense, or capable. 'a formidable opponent' 'Whoever it was, they have assembled a formidable array of talent and spent a lot of money.'
In this manner, what is a formidable person?
English (US) Formidable means capable or "is able to do something and do it well". So by calling someone "formidable" you are calling them capable or a person who has everything in order depending on the context.
Likewise, does formidable mean impressive?
If you describe something or someone as formidable, you mean that you feel slightly frightened by them because they are very great or impressive.
"Formidable" has an essentially negative aspect, a hint that there is some competition or conflict.