Dictionary
brain fog
Definition of BRAIN FOG
: a usually temporary state of diminished mental capacity marked by inability to concentrate or to think or reason clearly
ADVERTISEMENT
First Known Use of BRAIN FOG
1853
Browse
Next Word in the Dictionary: brain freezePrevious Word in the Dictionary: brain–fever birdAll Words Near: brain fog
ADVERTISEMENT
Seen & Heard
What made you want to look up brain fog? Please tell us where you read or heard it (including the quote, if possible).