The quality or state of being inattentive or not paying close attention.

ध्यान की कमी होना

English Usage: His inattentiveness during the lecture resulted in poor understanding of the material.

Hindi Usage: लेक्चर के दौरान उसकी ध्यान की कमी के कारण सामग्री की अच्छी समझ नहीं बनी।