Describing a person who does not smile.

ऐसा व्यक्ति जो मुस्कान नहीं करता

English Usage: She had a smileless demeanor that made her seem unfriendly.

Hindi Usage: उसका मुस्कान का अभाव वाला व्यवहार उसे असभ्य महसूस कराता था।

The state of lacking a smile.

मुस्कान का अभाव

English Usage: His expression was completely smileless during the serious discussion.

Hindi Usage: गंभीर चर्चा के दौरान उनका चेहरा पूरी तरह से मुस्कान का अभाव था।