Daunting, or threatening
A traffic warden, a lady of a minatory aspect, stood by the car. She pointed to a notice on the wall. “Can’t you read?” she said.
— William Golding, nobel lecture
In the recurring dream my mother stands in her bridal gown under the burning lilac, with Bernard Shaw and Bertie Russell kissing her hands; the house behind her is in ruins; she is wearing an owl's face and makes barking noises. Her minatory finger points.
This word has the same origin as “menace”; the Latin word minari