Note: in BRIT, also use 'unrecognised'
1.
If someone does something ~, nobody knows or recognizes them while they do it.
He is believed to have worked unrecognised as a doorman at East End clubs...
ADJ: ADJ after v, v-link ADJ
2.
If something is ~, people are not aware of it.
There is the possibility that hypothermia can go ~...
There must be many vases, bowls or bottles sitting unrecognised in people’s homes...
ADJ: ADJ after v, v-link ADJ, ADJ n
3.
If you or your achievements or qualities are ~, you have not been properly appreciated or acknowledged by other people for what you have done.
Hard work and talent so often go unrecognised and unrewarded...
There really is a wealth of unrecognised talent out there.
ADJ: ADJ after v, v-link ADJ, ADJ n
4.
An ~ meeting, agreement, or political party is not formally acknowledged as legal or valid by the authorities.
Local authorities are likely to refuse to hire facilities to unrecognised martial arts organisations.
ADJ: usu ADJ n