without a trace
Without showing or leaving behind any sign of something; tracelessly.
Without a trace of irony I can say I have been blessed with brilliant enemies. I owe them a great debt, because they redoubled my energies and drove me in new directions. E. O. Wilson
"I'm very sorry,” the drone said, without a trace of contrition. Iain Banks
If a North Korean university professor is suspected of insufficient enthusiasm for the system, they will be gone without a trace very quickly. Even the memory of the unlucky victim would likely disappear, since such topics are best not discussed in North Korea. Andrei Lankov
Superstition saw Something it had never seen before: Brown eyes that loved without a trace of fear, Beauty so sudden for that time of year. Jean Toomer
What might be taken for a precocious genius is the genius of childhood. When the child grows up, it disappears without a trace. It may happen that this boy will become a real painter some day, or even a great painter. But then he will have to begin everything again, from zero. Pablo Picasso
The tree will not sway without a trace of wind. Afghan Proverb