cứ means "persistently" (adverb). persistently (doing something even though one shouldn't or was told not to).
How is cứ pronounced?
You can listen to cứ on this page in both Northern and Southern Vietnamese accents.
How is cứ used in a sentence?
For example: Tôi đã bảo đừng đi mà anh ấy cứ đi. (I've already told him not to go, but he persistently insists on going.); Trời mưa mà cô ấy cứ ra ngoài. (It's raining, but she persistently wants to go out.).
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