uncongenial vs unfriendly

uncongenial and unfriendly both are adjectives.

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

As adjectives, uncongenial and unfriendly are synonyms defined as:

Other synonyms of uncongenial include hostile.

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