"ailing" in the verb sense
be ill or unwell
2. trouble, ail, pain
cause bodily suffering to and make sick or indisposed
"ailing" in the adjective sense
1. ailing, indisposed, peaked, poorly, sickly, unwell, under the weather, seedy
somewhat ill or prone to illness
"my poor ailing grandmother"
"feeling a bit indisposed today"
"you look a little peaked"
"a sickly child"
"is unwell and can't come to work"
Source: WordNet® (An amazing lexical database of English)
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