
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.

rugged
Describes a landscape that is steep, rocky, and jagged.
Die schroffe Felsküste fiel steil ins Meer ab.
The rugged rocky coast dropped steeply into the sea.

stark
Describes a contrast or difference that is very strong, sudden, and harsh.
Der schroffe Gegensatz zwischen der lauten Stadt und der stillen Natur war beeindruckend.
The stark contrast between the noisy city and the quiet nature was impressive.
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.
awesome / extreme
Both words can describe a very strong difference. “Krass” generally refers to a striking, extreme degree, while “schroff” also emphasizes a sudden and harsh contrast. “Schroff” is therefore especially suitable for an abrupt change between two states.

Der Unterschied zwischen den beiden Ergebnissen ist schroff.
The difference between the two results is stark.
Der Unterschied zwischen den beiden Ergebnissen ist krass.
The difference between the two results is extreme.