unfriendly vs uncongenial

unfriendly and uncongenial both are adjectives.

Word	Noun	Adjective	Verb	Adverb
unfriendly	No	Yes	No	No
uncongenial	No	Yes	No	No

As adjectives, unfriendly and uncongenial are synonyms defined as:

Other synonyms of unfriendly include hostile.

unfriendly (adjective)	uncongenial (adjective)
not disposed to friendship or friendliness	not suitable to your tastes or needs
not easy to understand or use	used of plant stock or scions; incapable of being grafted
very unfavorable to life or growth	very unfavorable to life or growth
not friendly