Her secretiveness made it difficult for friends to know what she was really thinking.

She secretively slipped the letter into his bag before he left.

They met in secret to discuss the plan.

The old archivist secretted the letters in a cedar chest to keep them safe.

The spy was secretting important documents in the false bottom of his suitcase.

The secreters in the greenhouse released a faint aroma that attracted pollinators.

The secreter in the study was found to secrete blood group antigens into saliva and mucus, influencing transfusion compatibility.

Her secretness about the project made her colleagues suspicious.

The hormone is secretable by certain glands during periods of stress.

To evaluate its therapeutic potential, the team studied the secretability of the novel peptide under different cellular conditions.