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Webster 1913 Edition

Adj.

Huge; very large.

[Colloq.]

Arbuthnot.

Byron.

–

Swinge′ing-ly

adv.

Dryden.

swingeing

swingeing ‎(comparative more swingeing, superlative most swingeing)

(Britain) large, immense
powerful, scathing (a swingeing verbal attack)
- The Economist, June 16th 2012. "Special Report: The melting north", p. 4.
  Perhaps not since the felling of America's vast forests ... has the world seen such a spectacular environmental change. The consequences for Arctic ecosystems will be swingeing.