Webster's Revised Unabridged Dictionary · 1913

low-level

low-level , adjective

1.
weak; not intense; as, low-level radiation.
2.
lower in rank or importance.
3.
at a low level in rank or importance; as, a low-level job; low-level discussions.
4.
occurring at a relatively low altitude; as, a low-level strafing run; low-level bombing.