Like chimps and bonobos, humans have subtle and flexible social instincts, allowing them to form extended families, lifelong friendships, and political alliances.

She knew, moreover, by that subtle instinct which had become a second nature and which warned her whenever he meant to go.

The result is a fractured production in which Mr. Robinson seemed to yearn for the prerogatives accorded the contemporary opera director without trusting his more subtle instincts.

"I don't know how-" The subtle instinct of a woman in love had given her vague warning of the incredible change in him, Gordon knew.

No scientist has yet been audacious enough to attempt to explain, even to his own satisfaction, toward what lands these winged fowls are guided by their subtle instinct.

Who shall say what subtle instinct caused Octavia to turn and smile at him with a wistful, friendly look that warmed his heart?

Giles had known that, had perceived it at once with the unexpectedly subtle instinct that was his gift, and he did not want to add to her sorrow.

No sooner had the idea flickered through his brain than some subtle instinct told Ragnar that it was the truth.

But it seemed that our guide knew the way, as if led by an instinct more subtle than memory or intelligence; and at no time did he hesitate.

She pressed her form closer to his side with a subtle and naive instinct of seduction.