unkind (adj.)
- callous
- cruel
- disagreeable
- flinty
- hard
- harsh
- heartless
- ill
- inconsiderate
- inflexible
- inhospitable
- inhuman
- insensitive
- mean
- rigid
- severe
- stern
- thoughtless
- tough
- unaffectionate
- unbending
- uncaring
- uncharitable
- unchristian
- uncompassionate
- unconcerned
- uncordial
- unfeeling
- ungracious
- unkindly
- unloving
- unsympathetic
- unsympathizing
- unthoughtful
- unyielding
Blow, blow, thou winter wind!
Thou art not so unkind
As man's ingratitude.
Rich gifts wax poor when givers prove unkind.
