Meaning of “sentimental” - Learner’s Dictionary

sentimental

adjective uk us /ˌsentɪˈmentəl/
FEELING

showing kind feelings such as sympathy, love, etc, especially in a silly way:

a sentimental song
The British are very sentimental about animals.
VALUE

related to feelings and memories and not related to how much money something costs:

It wasn't an expensive ring but it had great sentimental value.
sentimentality uk us /ˌsentɪmenˈtæləti/ noun [ U ]

(Definition of “sentimental” from the Cambridge Learner’s Dictionary © Cambridge University Press)