If something is overwhelming, it affects you very strongly, and you do not know how to deal with it.
e.g. The task won't feel so overwhelming if you break it down into small, easy-to-accomplish steps...
e.g. She felt an overwhelming desire to have another child.
Women of his own middle class found him overwhelmingly attractive.
...the overwhelmingly strange medieval city of Fès.
You can use overwhelming to emphasize that an amount or quantity is much greater than other amounts or quantities.
e.g. The overwhelming majority of small businesses go broke within the first twenty-four months...
e.g. The party won an overwhelming victory in Burma's general elections last May...
The House of Commons has overwhelmingly rejected calls to bring back the death penalty for murder...
Although things are changing the medical establishment is still overwhelmingly male.