Dictionary.com
Thesaurus.com

lockfast

British  
/ ˈlɒkˌfɑːst /

adjective

  1. securely fastened with a lock

"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

His final conviction before he became a foster carer was theft from a lockfast place in 1978 - eight years before he began fostering.

From BBC

My old porter will open all the lockfast places for him.

From Project Gutenberg

Besides what I have named, there was not another thing in that great, stone-vaulted, empty chamber but lockfast chests arranged along the wall and a corner-cupboard with a padlock.

From Project Gutenberg

For it seems he had observed the place where Kalamake kept his treasure, which was a lockfast desk against the parlour wall, under the print of Kamehameha the Fifth, and a photograph of Queen Victoria with her crown; and it seems again that, no later than the night before, he found occasion to look in, and behold! the bag lay there empty.

From Project Gutenberg

There was a shelf of books besides, and a family Bible in the midst of the table, and the lockfast writing-desk against the wall; so that anyone could see it was the house of a man of substance.

From Project Gutenberg