It doesn't mean anything -- it's not recognized, at least not by any dictionary, as a word (try looking it up). Usually the word people are looking for is "disconcerting", meaning "upsetting one's composure" or "causing dismay or concern". Sometimes people use "disconcerning" when the word they're really looking for is "discerning", meaning "showing good understanding or appreciation".
Dis means away
The prefix 'dis' means not or the opposite of something.
Counter
dissentient There were some dissentient opinions at the meeting.
prevent, stop
Dis means away
The stem "dis-" means "apart" or "away" in words like disassemble (take apart), disconnect (separate), and disappear (vanish).
DIS means disqualified.
"Dis" is a prefix meaning "apart" or "away." In the word "disrupt," it implies breaking apart or interrupting the normal flow or continuity of something.
Dis place as opposed to dat place.
The prefix 'dis' means not or the opposite of something.
The French word "dis" is the second-person singular imperative form of the verb "dire," which means "to say" or "to tell." It is used to give a command or instruction to someone.
'Dis fromage' means 'say cheese' in French.
DIS means Daytona International Speedway.
Dis gives an opposite meaning when it is added to the word given.
Dis means not or opposite of. Some other examples are dismiss and disrespect.
"Dis".....Usually means something like,unaproved,or failed in life.