A desolate person is a homeless person or a drunkard, very repulsive in appearance, smell, etc.
1. homeless or drunk, very repulsive in appearance, smell, etc. Example: ‘I got into the back car of the tram because it was completely empty. But it turned out that it was because of a desolate man and it was impossible to stay there.” 2. the protagonist of the disinformation scene, usually a permanently dissatisfied individual on the fringes of society, who compensates for his frustration in life by rejecting social authority and turning to conspiracy theories and political extremism
Source https://cestina20.cz/slovnik/dezolat/