sympathisch
likable
A person or thing that comes across in a pleasant way and evokes affection or positive feelings; nice and lovable.
Ich finde deine neue Kollegin auf Anhieb sehr sympathisch.
I immediately find your new colleague very likable.

likable
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likable
A person or thing that comes across in a pleasant way and evokes affection or positive feelings; nice and lovable.
Ich finde deine neue Kollegin auf Anhieb sehr sympathisch.
I immediately find your new colleague very likable.

'Sympathisch' (likable) means 'nice' or 'lovable'. It is not the same as the English word 'sympathetic', which means 'mitfühlend' (compassionate).
Mein neuer Nachbar ist wirklich sehr sympathisch.
My new neighbor is really very likable.
To express who finds a person likable, a construction with the dative is often used. The person who has the feeling is in the dative.
Seine offene Art war mir sofort sympathisch.
His open manner was immediately likable to me.
A very common way to use this word is with the verb 'finden' (to find). The person you find likable is in the accusative.
Ich finde deine Freunde sehr sympathisch.
I find your friends very likable.
nice
'nett' and 'sympathisch' can both describe a person positively. 'nett' often says that someone is friendly and behaves pleasantly. 'sympathisch' describes more strongly how someone comes across to us: we like the person or have a good feeling about them. The words can be confused because nice people are often also likable. But someone can act nicely without you finding them especially likable. 'nett' fits more with behavior, while 'sympathisch' fits more with personal impression.

Im Supermarkt wirkt der neue Mitarbeiter sofort sympathisch.
In the supermarket, the new employee immediately comes across as likable.
Sie ist nett zu den Patienten und nimmt sich Zeit für ihre Fragen.
She is nice to the patients and takes time for their questions.