schroff
brusque
Describes a person's behavior that is curt, unfriendly, and rude.
Seine schroffe Art macht es schwer, mit ihm ins Gespräch zu kommen.
His brusque manner makes it hard to strike up a conversation with him.

brusque / rugged
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brusque
Describes a person's behavior that is curt, unfriendly, and rude.
Seine schroffe Art macht es schwer, mit ihm ins Gespräch zu kommen.
His brusque manner makes it hard to strike up a conversation with him.

The meaning of 'schroff' depends on the noun it describes. If it refers to a person or their words, it means 'unfriendly'. If it describes a landscape, it means 'steep and rocky'. With abstract nouns like 'Gegensatz' (contrast), it means 'harsh and sudden'.
Er gab mir eine schroffe Antwort.
He gave me a brusque answer.
When it is about unfriendly behavior, 'schroff' is often connected with communication. Typical phrases are 'eine schroffe Antwort' (a brusque answer), 'ein schroffer Ton' (a brusque tone), or the adverbial phrase 'jemanden schroff abweisen' (to reject someone brusquely).
Sein schroffer Tonfall hat mich sehr überrascht.
His brusque tone surprised me a lot.
When describing landscapes, 'schroff' is often combined with geological features. Common combinations are 'schroffe Felsen' (rugged rocks), 'eine schroffe Bergwand' (a rugged mountain face), or 'eine schroffe Küste' (a rugged coast).
Die schroffen Felsen ragten aus dem Meer.
The rugged rocks jutted out of the sea.
friendly
'freundlich' and 'schroff' are opposites when describing people's behavior. 'freundlich' describes a nice, polite, and pleasant manner. 'schroff' describes a harsh, curt, and unfriendly manner. Someone who answers in a friendly way shows respect and openness. Someone who answers brusquely seems dismissive or impatient. For landscapes or strong contrasts, 'schroff' can also have other meanings, but here it is about how people deal with others.

Beim Termin antwortete er schroff und sah kaum von seinen Papieren auf.
At the appointment, he answered brusquely and barely looked up from his papers.
Die Ärztin ist freundlich und nimmt sich Zeit für meine Fragen.
The doctor is friendly and takes time for my questions.