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Webster 1913 Edition

Adj.

Immeasurable.

[R.]

Spenser.

Adj.

Exceeding common measure.

immeasured ‎(comparative more immeasured, superlative most immeasured)

That has not been measured; huge, enormous.
- 1590, Edmund Spenser, The Faerie Queene, II.xii:
  Bright Scolopendraes, arm'd with siluer scales, / Mighty Monoceroses, with immeasured tayles.