His ill-considered decision led to disastrous consequences.

The ill-conceived project failed miserably.

He made a decision based on ill-informed opinions.

The detective was assigned to investigate the house of ill repute in the city's red-light district.

She has been struggling with mental illness for years.

Engaging in illegal activities can result in severe consequences.

The act of stealing is considered illegality.

The handwriting on the document was illegible.

The illegitimacy of his actions was evident to everyone.

He was arrested for illegally downloading movies.