Having no link, no relationship, no shared cause. Used mainly of two or more events, facts, problems, or situations that might look related but are not: *the two fires were unconnected*, *her resignation is unconnected with the investigation*, *a series of apparently unconnected incidents*. Watch the grammar, because it decides the meaning. With *with* or *to*, it means one thing has nothing to do with another: *unconnected with the case*. Standing alone after a plural, it means those things have nothing to do with each other: *the two crimes were unconnected*. This word does real work in careful writing and in the news, especially when someone is denying a link people suspect: *the minister said his trip was entirely unconnected with the deal*. That *entirely* or *wholly* in front is very common. There is also a plain physical sense — a machine, pipe, or wire not joined up: *the printer is unconnected*, *the gas supply was still unconnected*. And in older or more literary writing you may see it about a person with no useful family or social ties, but that use is rare now.