fastly

About 0.02 uses per million words.

Meaning

1. adverb In a secure or firm manner; securely.

   We tied the rope fastly this time; we didn't want it to get away again.

2. adverb Quickly.

Similar words

fast firmly securely solidly safely assuredly steadfastly squarely tight tightly

Often followed by

and growing to changing in bound approaching