Disengagement behaviors (looking away, leaning back, narrowed eyes, frowns, etc.) signal that a person is bored, angry, or defensive.

FORBES: How Savvy Negotiators Read Your Body Language

And she could hold the snow globe to her narrowed eyes and watch the whirling white flakes fall until they blinded her.

NPR: Excerpt: 'The Member of the Wedding'

We gaze intently at one another, unconsciously monitoring the wide eyes of surprise or pleasure and the narrowed eyes of suspicion or dislike.

FORBES: The Impact of Eye Contact

He acted with his creased brow, his jagged bone structure, and his narrowed eyes, as well as with the muscles in his chest, shoulders, and neck.

NEWYORKER: Mr. Majestyk

Finishing the tale, Husna was silent for a moment, then narrowed her eyes, collecting herself.

NEWYORKER: In Other Rooms, Other Wonders

The little girl, her eyes narrowed, gave them a defiant stare.

NPR: Eggers Blends Fact, Fiction of Sudanese 'Lost Boys'

The old man was heavy and gray-haired, with eyes narrowed and mouth slightly open, as if he were asthmatic, but he was smiling as well as he could.

NEWYORKER: Free Radicals

His eyes narrowed, sensing he was walking into unchartered territory.

FORBES: Why We Buy and Sell

He's a creature of habitual poses -- lips pursed in a smile that mocks mirth, eyes narrowed by a need to dominate, and, beneath it all, motives as opaque as the squid ink he requires for his drawings.

WSJ: 'Door in the Floor' Hinges on Performances