dwindling

US /ˈdwɪn.dəl.ɪŋ/
UK /ˈdwɪn.dəl.ɪŋ/
1.

azalan

gradually becoming smaller in size or amount, or fewer in number:

:
•
She is one of a dwindling number of people who was alive in 1918.
:
dwindle