adj. 25B6; adjective
his ailing mother : ILL, unwell, sick, sickly, poorly, weak, indisposed, in poor/bad health, infirm, debilitated, delicate, valetudinarian, below par; Brit. off colour; informal laid up, under the weather.
the country's ailing economy : FAILING, in poor condition, weak, poor, deficient.
healthy.