Princeton's WordNet
ailing, indisposed, peaked(p), poorly(p), sickly, unwell, under the weather, seedy(adj)
somewhat ill or prone to illness
Antonyms:
well
Dictionary of English Synonymes
ailing(a.)
Synonyms:
sickly, sick, ill, indisposed, unwell, diseased, feeble, languishing, unhealthy
PPDB, the paraphrase database
List of paraphrases:
faltering, sick, embattled, stumbling, ill, patient, deadlocked, weakened
© Synonyms.com