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Webster 1913 Edition

Adj.

Revengeful; deserving revenge.

[Obs.]

Spenser.

–

Venge′a-bly

adv.

[Obs.]

Adj.

venj'able. [from venge.] Revengeful; as vengeable despite. [Not in use.]

vengeable ‎(comparative more vengeable, superlative most vengeable)

(obsolete) Vengeful.
(obsolete) Prompted by or characterised by revenge; severe, cruel.
- 1590, Edmund Spenser, The Faerie Queene, II.iv:
  I sought / Vpon my selfe that vengeable despight / To punish

vengeable m ‎(oblique and nominative feminine singular vengeable)