Nîn (tear) + -ui (full, having that quality).
Sindarin
nínui
noun/adjective. watery
nínui
noun/adjective. the month of february
nínui
noun. February, *Watery
nínui
february
nínui
5~B5hJ adjective. tearful
nínui
february
nínui
tearful
(watery); no distinct pl. form
nínui
watery
(tearful); no distinct pl. form
Nínui