Which input feature is least important in the random forest?

$\backslash$table$[[$Feature$,$Importance$],[x4,0\mathrm{.}4287],[x2,0\mathrm{.}2216],[x1,0\mathrm{.}1784],[x5,0\mathrm{.}0968],[x3,0\mathrm{.}0605],[x6,0\mathrm{.}0140]]$

$4$

x$3$

x$5$

x$6$