Painful; troublesome.To affect with pain or uneasiness, either of body or of mind; trouble: used in relation to some uneasiness or affection whose cause is unknown: as, what ails the man?To feel pain; be ill (usually in a slight degree); be unwell: now used chiefly in the present participle: as, he is ailing to-day.n. Indisposition or morbid affection; ailment.n. The beard of wheat, barley, etc., especially of barley: chiefly in the plural.