विलंब से।

श्याम परीक्षा भवन में देर से पहुँचा।
उसने विलंबतः यह कार्य शुरू किया।
अशीघ्रतः, देर से, देरी से, विलंबतः, विलंबपूर्वक

Later than usual or than expected.

The train arrived late.
We awoke late.
The children came late to school.
Notice came so tardily that we almost missed the deadline.
I belatedly wished her a happy birthday.
belatedly, late, tardily