cheerfulness

US /ˈtʃɪr.fəl.nəs/
UK /ˈtʃɪr.fəl.nəs/
1.

sự vui vẻ

the state of being happy and positive:

:
•
It's hard not to be affected by her enthusiasm and cheerfulness.
:
cheerscheercheerfulcheer oncheer upcheap and cheerful