Tā màntūntūn de chī zhe zǎofàn, yīdiǎn dōu bù zhāojí.
She ate her breakfast at a leisurely, unhurried pace.
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usage
慢吞吞 is a reduplicated adjective pattern (AAB or ABB). The reduplicated 吞吞 intensifies the meaning of slowness and often carries an impatient or exasperated connotation. Contrast with 慢慢 (mànmàn) which is more neutral.