1. An indirect or delicate hint or proposal that is not openly stated but implied or inferred
The teacher made a subtle suggestion that the student should study harder.
A professora fez uma sugestão sutil de que o aluno deveria estudar mais.
2. A gentle, understated recommendation or idea conveyed in a discrete manner
With a subtle suggestion of her head, she indicated the exit.
Com uma sugestão sutil de sua cabeça, ela indicou a saída.