If you're frequently ill, or often under the weather, you're sickly. A sickly child tends to miss a lot of school.

Sickly people aren't in perfect health — they are prone to coming down with illnesses, or they just generally don't feel well. You can also describe someone as appearing sickly, if their faces are pale and unhealthy-looking. This "habitually ailing" meaning dates from the fourteenth century, and for a brief time it was also used to mean "causing illness."

Definitions of sickly
  1. adjective
    somewhat ill or prone to illness
    “a sickly child”
    synonyms: ailing, indisposed, peaked, poorly, seedy, under the weather, unwell
    ill, sick
    affected by an impairment of normal physical or mental function
  2. adjective
    unhealthy looking
    synonyms: sallow
    not in or exhibiting good health in body or mind
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