means reserved and unwilling to communicate.The man was reticent when his wife died.
In Germany people were reticent; if they did talk they could be put to death.
I was reticent about reveling the source of my information.
Mary was reticent or reluctant about bungee jumping off of the cliff.
Meaning : silent, quite, tighghtly closed-lips, secretive, close-mouthed I think now you can make the sentence.