Not kind, lacking in friendliness, warm-heartedness or sympathy. / (archaic) Rough, unfavourable, bad. / (obsolete) Unnatural, contrary to the natural or proper order of things.

In an unkind manner. / (obsolete) In an unnatural manner.

comparative form of unkindly: more unkindly

(dated) Unkindness. / (archaic) Unfavourableness. / (obsolete) Unnaturalness.