Meaning : Not suitable to your tastes or needs.
							Example : 
							The uncongenial roommates were always fighting.
							The task was uncongenial to one sensitive to rebuffs.
							
Synonyms : incompatible
Suitable to your needs.
A congenial atmosphere to work in.Meaning : Very unfavorable to life or growth.
							Example : 
							A hostile climate.
							An uncongenial atmosphere.
							An uncongenial soil.
							The unfriendly environment at high altitudes.
							
Synonyms : hostile, unfriendly
Meaning : Used of plant stock or scions. Incapable of being grafted.