To burn slowly with smoke but no flame.

To show suppressed feelings or emotions.

दबी हुई भावनाओं या संवेदनाओं को दिखाना

English Usage: She smoldered with anger after being insulted in front of her friends.

Hindi Usage: दोस्तों के सामने अपमानित होने के बाद वह गुस्से से जल उठी।

A state of burning slowly without flame, often producing smoke.

धूआँ निकालते हुए धीरे-धीरे जलना

English Usage: The smolder of the campfire could be seen long after everyone had gone to bed.

Hindi Usage: जब सभी सो गए थे, तब कैम्पफायर की धुआँ निकालते हुए आग को देखा जा सकता था।