Her subtle gesture of nodding encouraged him to continue speaking.
A simple sentence uses a subject and a verb..
She chose fabrics in subtle shades of grey.
The dawn revealed subtle nuances in the coloration of the rocks. That hint was not very subtle.
Her subtle smile hinted at a secret she was holding.
Her perfume was so subtle that he could only catch a hint of it when she passed by.
Complex (APEX)
I gave my friend a subtle hint from across the room.
Like this; I am an architect.
I am unsympathetic to your need.
i think politicaly
The field had boundaries.