This is the past participle of the word bereave and means lacking or deprived of something. It may seem a bit of an odd word but it does crop up quite frequently in speech and writing as it does sum up a situation rather well.
Her husband’s early death left Letty bereft of not only a partner but a future as she had dedicated everything to Marcus and his career.
The room was bereft of all comforts, all she could see was a single bed with a thin mattress and a cold metal chair. This was to be her home for the foreseeable future.