unmanned

unmanned

CEFR: C1-C2 /un-manned/ [ah0.n.m.ae1.n.d]

Definition: Not having or needing a crew or staff:Example senences:

Example Sentences:
Baxter's book was fiction, but we're seeing the same trade-off now in NASA's decision to cancel further unmanned missions and bring down the Hubble space telescope in order to spend more money on manned spaceflight development.