Definify.com

Webster 1913 Edition

Unbenign

Unˊbe-nign′

,

Adj.

Not benign; malignant.

Webster 1828 Edition

Unbenign

UNBENIGN

,

Adj.

Not benign; not favorable or propitious; malignant.

Definition 2024

unbenign

unbenign

English

Adjective

unbenign ‎(comparative more unbenign, superlative most unbenign)

Not benign; malevolent.
- 2008 March 16, Benjamin Black, “The Lemur”, in New York Times:
  They gave him, those eyes, the look of being always meanly at work on some extended, crafty and unbenign calculation.