Somewhat diseased or sickly; showing signs of illness or discomfort; uneasy about one's health.
From disease + -y (suffix making adjectives). This colloquial formation follows English patterns like 'bony' or 'meaty', adding -y to nouns to create descriptive adjectives.
In Victorian novels, characters are often described as 'diseasy' when they have vague, undefined ailments—this reflected real medical confusion before germ theory, when people suffered mysteriously without clear diagnosis.
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