vimで強制的に十字キー使えなくする方法

これは目から鱗

nnoremap <Left> :echo "No left for you!"<CR>
vnoremap <Left> :<C-u>echo "No left for you!"<CR>
inoremap <Left> <C-o>:echo "No left for you!"<CR>
nnoremap <Right> :echo "No right for you!"<CR>
vnoremap <Right> :<C-u>echo "No right for you!"<CR>
inoremap <Right> <C-o>:echo "No right for you!"<CR>
nnoremap <Up> :echo "No up for you!"<CR>
vnoremap <Up> :<C-u>echo "No up for you!"<CR>
inoremap <Up> <C-o>:echo "No up for you!"<CR>
nnoremap <Down> :echo "No down for you!"<CR>
vnoremap <Down> :<C-u>echo "No down for you!"<CR>
inoremap <Down> <C-o>:echo "No down for you!"<CR>

https://vi.stackexchange.com/questions/5851/how-to-disable-arrow-keys-in-vim