Their assorted subterfuges were growing more and more subtle.

The boy's growing quite gratifyingly subtle, in his maturity.

But the rhythms of his impassive walk and hand-claps grow more complex and subtle.

Instead, Spock realized, they simply grew more subtle in expressing it.

Calandria's smile grew even more subtle, and Axel's face had hardened into an imperious mask.

Framed by the bulk of his shoulders, the "agony" grew subtle.

What if our mechanisms of control grew so subtle and so powerful that they ceased to be a spectacle at all?

Batty had listened, nodding slowly, his smile growing thin and subtle.

My part will get more complicated while stress-induced submotivations grow increasingly subtle.

As he adapted himself to this reputation, Deems indeed grew subtle in his affairs, until man and reputation became one.