George Stevenson (70) was last seen in the High Station Road area of Falkirk at around 11pm on Friday, February 10, and has since failed to return to his home in Glenfuir Court or make contact with family or friends.
Further enquiries have revealed that he may have walked along Gartcows Road in Falkirk around 11.20pm on the night he disappeared.
A friend of Mr Stevenson’s, who has asked not to be named, told The Falkirk Herald this week that, on the night of his disappearance, he visited a female friend in Kemper Avenue and left her house at around 11pm.
The friend said: “George has been a little depressed recently.
“His mum died about two years ago and I think some of the purpose in his life went because he used to dote on her.
“He didn’t go out very much and was a bit of a loner who kept himself to himself so being out as late as he was on the night he went missing was a bit out of character for him. He was never out at night.
“George is a true friend. If you were in trouble or needed money for anything he would be there for you.
“He hasn’t been into his bank account or touched his pension since he went missing so I’ve been a bit worried about that.
“If he is out there he should get in touch with someone to let us know he’s okay.”
Mr Stevenson is described as white, 5ft 8in tall with thinning hair on top and longer hair at the back and sides.
He is believed to be wearing a green tammy, black jacket, long cardigan, blue and white checked shirt, black jeans and khaki-coloured trainers.
Police say they are “extremely anxious” over the disappearance Mr Stevenson and are appealing for information to his whereabouts.
Detective Inspector Jim Thomson of Falkirk CID said: “George has now been missing for nearly a month and we are still extremely anxious to trace his whereabouts. Although we have already had a strong response to our appeal, we are still missing that key piece of information that will allow us to trace him.
“I would again ask anyone who was in the Gartcows Road area of Falkirk on the night of Friday, February 10, to contact Police Scotland immediately on 101, as they may be able to assist our investigation. Your information might be what leads us to finding George.
“Our searches will continue, with particular focus on the most likely routes that George would have taken that evening including public spaces, woodland, unused buildings, gardens and outhouses along with a section of the canal and towpaths.
“His family are being kept fully up to date with the work of the enquiry team.”
Anyone with information is asked to call 101.