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Webster 1828 Edition

Adj.

Cross, crabbed; surly; intractable; of habitual bad temper; peevish; fractious. An ill-natured person may disturb the harmony of a whole parish.

That indicates ill-nature.

The ill-natured task refuse.

Intractable; not yielding to culture; as ill-natured land. [Not legitimate.]

ill-natured ‎(comparative more ill-natured, superlative most ill-natured)

irritable or malevolent

Finnish: äkeäluontoinen, pahansisuinen (bad-tempered); pahantahtoinen (fi) (malevolent)