Meaning

• (manner) Firmly, vigorously, with strength or exertion.

• (manner) Harshly, severely; in a hard manner.

  "I can't really deal hardly with people."

• With difficulty.

• (degree) Barely, only just, almost not.

  "they hardly ever watch television;  I hardly think they'll come in this bad weather;  it's hardly possible he could lose the election."

Meaning

• Not really.

  "I think the Beatles are a really overrated band. ― Hardly!"