दृढ़ता के साथ।

उसने दृढ़तापूर्वक प्रहार किया।
जमकर, दृढ़तापूर्वक, मजबूती से, मज़बूती से

Firmly and solidly.

Hit the ball squarely.
The bat met the ball squarely.
Planted his great bulk square before his enemy.
square, squarely