sickly
1. [ adjective ] unhealthy looking
Synonyms: sallow
Related terms: unhealthy
2. [ adjective ] somewhat ill or prone to illness
Synonyms: ailing peaked poorly under_the_weather unwell indisposed
Examples:

"my poor ailing grandmother" "feeling a bit indisposed today" "you look a little peaked" "feeling poorly" "a sickly child" "is unwell and can't come to work"

Related terms: ill
3. [ adjective ] somewhat ill or prone to illness
Synonyms: ailing peaked poorly unwell indisposed
Examples:

"my poor ailing grandmother" "feeling a bit indisposed today" "you look a little peaked" "feeling poorly" "a sickly child" "is unwell and can't come to work"

Related terms: ill
Similar spelling:   sickle
  Sicily
  sisal
  Sigel