Fastly

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

Source: wiktionary

Before them was a door which apparently led into the grand apartments; this was fastly secured, but it yielded to their united strength, and they entered a lofty hall, whose concave top was supported by pillars.

Source: wiktionary

A reuerend man that graz’d his cattell ny, / Sometime a bluſterer that the ruffle knew / Of Court of Cittie, and had let go by / The ſwifteſt houres obſerued as they flew, / Towards this afflicted fancy faſtly drew: / And priuiledg’d by age deſires to know / In breefe the grounds and motiues of her wo.

Source: wiktionary

Another time, my Mother seeing them come fastly to her house, my brother gave the key of his desk to my sister, bidding her convey the money somewhither; […]

Source: wiktionary