impossibly
adv. B2 Upper Intermediate US //ˌɪmˈpɑsəbɫi// UK //ɪmpˈɒsəbli// im·pos·si·bly
adv. in a way that is very difficult or impossible to do. You use this when something seems so hard that you think it cannot be done at all.
adv. in a manner that is extremely difficult or impossible to achieve. Often used to emphasize the degree of difficulty or the impossibility of a situation.
The task is impossibly difficult for a beginner.
The mountain peak was impossibly high, making the climb seem like a dream rather than a reality.
The architect's vision was impossibly ambitious for the budget, requiring materials and labor that the city council could not afford to provide.
From impossible + -ly.