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The word reticent is an adjective.
I was reticent about revealing the source of my information.
OR
She was never reticent about her dislike for country music.
He was reticent to tell the truth for fear he would be punished.
The suspect was reticent to answer the question because he did the crime.
In Germany people were reticent; if they did talk they could be put to death.
means reserved and unwilling to communicate.
The man was reticent when his wife died.