Not one stray word or phrase to make you realize that it was a private conversation?" She paused, and seemed to reflect, still outwardly as calm as ever. 
Not one word out of place, to make you notice it was a private talk?
How easily did you realize that it was a private conversation?
pp. 78-98 of Productivity Business Sector and Major Subsectors, BLS Handbook of Methods (May 1998)
The man is dancing.
The man and woman are relaxing at home.
The flag is American.
the child was 18 years old
Mr. Brown succeeded yet again.