In case you have multiple version of anaconda,
rm -rf ~/anaconda2 [for version 2]
rm -rf ~/anaconda3 [for version 3]
Open .bashrc file in a text editor
vim .bashrc
remove anaconda directory from your PATH.
export PATH="/home/{username}/anaconda2/bin:$PATH" [for version 2]
export PATH="/home/{username}/anaconda3/bin:$PATH" [for version 3]