The Vietnamese word "khắc khoải" is an adjective that describes a feeling of deep worry or anxiety. It conveys a sense of longing or restlessness, often associated with a strong emotional state where someone is troubled by thoughts or feelings that they cannot easily shake off.
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While "khắc khoải" primarily refers to anxiety and longing, it can also imply a more poetic sense of yearning for something lost or unattainable, making it versatile in emotional contexts.