The 61-year-old has been described as white, 5ft and of slim build. He is balding with grey hair on the sides and has grey stubble and tattoos on his arm.
Mr Keith is known to normally wear walking boots and trousers.
People with further information about his whereabouts are urged to get in touch with police on 101 or on their website, quoting incident number 2633 of November 20.
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Inverness man wearing walking boots missing for 10 days
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