The state or characteristic of weakness, incapacity, or physical distress due to poor health, especially of a chronic nature.(noun)
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Use "sickliness" in a sentence
"As she approached Julie she raised her eyes absently, and Julie saw a face of singular and delicate beauty, marred, however, by the suggestion of physical fragility, even sickliness, which is carried with it."
""sickliness" which had since made her notable even in a community rich in pathological instances."
"To be fair, amid all the grumbling he finds plenty to admire, not least the lovely medieval jumble of Old Town in Estonia's capital, Tallinn; the music of Arvo Pärt; the Grimm flair of Estonian names Tarmo, Gerli, Epp; and, with characteristic contrariness, Vana Tallinn, a revolting liqueur of unidentifiable sickliness and bogus antiquity."