1.Definition: not suitable to your tastes or needs

"The uncongenial roommates were always fighting", "The task was uncongenial to one sensitive to rebuffs"

Related Adjective(s):incompatible

2.Definition: used of plant stock or scions; incapable of being grafted

3.Definition: very unfavorable to life or growth

"An uncongenial atmosphere", "An uncongenial soil"

Related Adjective(s):hostile, unfriendly