careful in what you say or do, in order to keep something secret or to avoid causing difficulty for somebody or making them feel embarrassed (Oxford)
2.careful not to cause embarrassment or attract too much attention, especially by keeping something secret (Cambridge)
He was always very discreet about his love affairs. (Oxford)
A discreet glance at the clock told me the interview had lasted an hour. (Cambridge)
very discreet about his love affairs
discreet glance at the clock
Attentive
Careful
Careless
Negligent
Discreetly