When searching for synonyms for the word, "sickly unhealthy," there are a plethora of words that come to mind. One option could be "unwell," meaning to feel ill or not healthy. Another word that may be applicable is "pale," as someone who is unwell may appear pale and sickly. "Weak," "faint," and "frail" all suggest a sense of physical weakness and unhealthiness. In addition, words such as "ailing," "diseased," and "debilitated" all imply a sense of sickness and poor health. Ultimately, when looking for synonyms for "sickly unhealthy," it is important to consider the specific context in which the word is being used to choose the most accurate and appropriate word.