sickly
     adj 1: unhealthy looking [syn: {sallow}]
     2: somewhat ill or prone to illness; "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" [syn: {ailing}, {indisposed},
         {peaked(p)}, {poorly(p)}, {unwell}, {under the weather}]
     [also: {sickliest}, {sicklier}]
Source: WordNet® 2.0

sickliest
     See {sickly}
Source: WordNet® 2.0