This is the 15193rd most frequent Turkish word.
sonsuz
Infinite; endless.
Here 'sonsuz' is used as 'infinite', describing something immeasurable in terms of extent or duration.
Evrenin sonsuz olduğu söylenir.
It is said that the universe is infinite.
In this sentence, 'sonsuz' is utilized metaphorically to suggest an extreme or immeasurable degree of cheerfulness.
Arkadaşlarla geçen zaman sonsuz neşeliydi.
The time spent with friends was infinitely cheerful.
Here, 'sonsuz' implies 'eternal', or never-ending in duration, describing something unending and perpetual.