tickless

adjective3

1. •
   Having interrupts occur only when required, rather than at regular intervals.
2. •
   Without a ticking sound.

   • Maybe with the new technology, they might have tickless bombs. They've had tickless clocks for years. And they even have seedless watermelons. So a tickless bomb should be routine. — 2018
3. •
   Lacking ticks (the insect).

   • Our suddenly tickless dog, now quite ticked-off, doesn't know who to kill first but by the time he rolls over, jaws snapping, the surgeons are practicing in the next county. — 1994