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Webster 1913 Edition

Adj.

Monstrous.

[Obs.]

monstruous ‎(comparative more monstruous, superlative most monstruous)

(now rare) Monstrous. [from 15th c.]
- 1596, Edmund Spenser, The Faerie Queene, VI.7:
  For he was sterne and terrible by nature, […] And rather like a Gyant monstruous […].