A notch is an indentation or a slight cut in a surface.

A notch can also refer to a particular level or degree of something.

किसी चीज़ का विशेष स्तर या डिग्री।

English Usage: He reached a new notch in his professional career.

Hindi Usage: उसने अपने पेशेवर करियर में एक नया स्तर हासिल किया।

Brittleness refers to the quality of being easily broken or shattered.

Brittleness can also describe a lack of flexibility in materials or substances.

सामग्रियों या पदार्थों में लचीलापन की कमी।

English Usage: The brittleness of the metal made it unsuitable for heavy machinery.

Hindi Usage: धातु की भंगुरता इसे भारी मशीनरी के लिए अनुपयुक्त बनाती है।