Fastly

adv

adv ·Rare ·Advanced level

Definitions

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

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

  2. 2
    quickly nonstandard

    "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."

Synonyms

All synonyms
fastfirmlysecurelytightly

Example

More examples

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

Etymology

Etymology 1

From Middle English fastly, fastliche, festliche, from Old English fæstlīċe (“firmly, constantly”), from Proto-West Germanic *fastulīkē, from Proto-West Germanic *fastulīkê (“securely, firmly”); equivalent to fast + -ly.

Etymology 2

From Middle English fastliche, fastly; equivalent to fast + -ly.

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.