1 gentle, mild, kindly.
2 fortunate, salutary.
3 (of the climate, soil, etc.) mild, favourable.
4 Med. (of a disease, tumour, etc.) not malignant.
Derivatives:
benignly adv.
Etymology: ME f. OF benigne f. L benignus f. bene well + - genus born
Useful english dictionary. 2012.