The word "ill-" is often used to denote something that is unpleasant or harmful. However, there are several synonyms for this word that can be used to convey a similar meaning. For instance, the word "unhealthy" can be used to describe something that is not beneficial for one's health. Similarly, the word "harmful" can be used to describe something that has the potential to cause damage. Other synonyms for the word "ill-" include "damaging," "toxic," "detrimental," "adverse," and "negative." These words can also be used to describe a wide range of situations or conditions that are undesirable in some way.