cứ means "persistently" (adverb). persistently (doing something even though one shouldn't or was told not to).
How is cứ pronounced?
cứ has 1 syllables: cứ: sắc (high rising). You can also listen to it on this page in both Northern and Southern accents.
How common is cứ in Vietnamese?
cứ is among the 500 most-used Vietnamese words, CEFR level C1.
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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