no good to someone—of no use or advantage to a person:
- Information is no good to us if we do not know how to use and share it.
not good to someone—said of smb. who is unkind to a person:
- She is not good to me and my children from another relationship.
Note: The expression does not correlate in meaning with the phrase not good for someone—
1. not beneficial or helpful for a person:
- This book, though not good for undergraduates, is the best book for graduate students in algebra.
2. (of food) not wholesome for a person:
- He had a theory of his own that ginger preserves and fruitcake were not good for sick people.