
unsympathisch
unlikeable
A person who makes an unpleasant or off-putting impression on others and does not inspire sympathy.
Ich fand den Verkäufer sehr arrogant und unsympathisch.
I found the salesperson very arrogant and unlikeable.
unpleasant / unlikeable
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unlikeable
A person who makes an unpleasant or off-putting impression on others and does not inspire sympathy.
Ich fand den Verkäufer sehr arrogant und unsympathisch.
I found the salesperson very arrogant and unlikeable.
Careful: 'unsympathisch' means 'not likeable, unpleasant, off-putting'. It is not the same as the English 'unsympathetic', which means lacking compassion or understanding.
Ich kann ihn nicht leiden, er ist mir einfach unsympathisch.
I can't stand him; I just find him unlikeable.
The word is the direct opposite of 'sympathisch' (likeable). The prefix 'un-' reverses the meaning and expresses a negative personal feeling.
Sein Lächeln wirkte auf mich irgendwie unsympathisch.
His smile seemed somehow unlikeable to me.
Because 'unsympathisch' describes a personal feeling, it is very often used with a dative pronoun that names the person who has this feeling. The structure is: 'Jemand ist mir/dir/ihm unsympathisch' (Someone seems unlikeable to me/you/him).
Seine arrogante Art ist mir total unsympathisch.
I find his arrogant manner completely unlikeable.
unpleasant
When describing a person, unangenehm generally refers to the discomfort their presence or behavior causes. Unsympathisch more specifically means that you do not feel any personal sympathy for them. Someone can therefore seem unsympathisch without behaving in a specifically unangenehm way.

Der neue Kollege ist mir unsympathisch, obwohl er höflich ist und mich nicht bedrängt.
I find the new colleague unlikeable, although he is polite and does not pressure me.
Der neue Kollege ist mir unangenehm, weil er ständig sehr persönliche Fragen stellt.
The new colleague makes me uncomfortable because he is constantly asking very personal questions.