sidelong

"She cast a sidelong glance at the clock, worried about being late."

"The sidelong approach of the car made it difficult for him to see who was inside."

"They exchanged sidelong smiles, aware of the shared secret between them."

"He looked sidelong at his friend, questioning his motives."

"The cat crept sidelong toward the unsuspecting bird."

"She walked sidelong around the pile of leaves, trying to avoid getting her shoes dirty."