not spontaneous; lacking a free or natural response; premeditated

अस्वाभाविक

English Usage: His unspontaneous reaction to the surprise party was quite noticeable.

Hindi Usage: आश्चर्य पार्टी पर उसकी अस्वाभाविक प्रतिक्रिया काफी स्पष्ट थी।

the quality of being unspontaneous or lacking spontaneity

अनियोजितता

English Usage: Her unspontaneousness made it difficult for her to enjoy the party.

Hindi Usage: उसकी अनियोजितता ने उसे पार्टी का मजा लेने में कठिनाई दी।