lockfast

Adjective

1. Fastened or secured with a lock.
   • It was such a scene of confusion as you can hardly fancy. All the lockfast places had been broken open in quest of the chart. - 1881–1882, Robert Louis Stevenson, Treasure Island, London; Paris: Cassell & Company,...
   • At this moment, however, the rooms bore every mark of having been recently and hurriedly ransacked; clothes lay about the floor, with their pockets inside out; lockfast drawers stood open; […] - 1886 January 5, Robert...