Not compatible or sympathetic, as in character.

not suitable to your tastes or needs; "the uncongenial roommates were always fighting"; "the task was uncongenial to one sensitive to rebuffs"[ant: congenial ]

very unfavorable to life or growth; "a hostile climate"; "an uncongenial atmosphere"; "an uncongenial soil"; "the unfriendly environment at high altitudes"[syn: hostile ]

used of plant stock or scions; incapable of being grafted

adjective

discordant , inconsonant , unharmonious , bad , disagreeable , displeasing , offensive , unsympathetic , asocial , discourteous , incompatible , incongruous , inharmonious , uncivil , ungregarious , unpleasant , unsociable

noun

incompatibility , uncongeniality , unsociability