惮 憚 dan4
dread; fear; dislike

strokes 11
radical
心
心
strokes after radical 8
忌惮 忌憚 ji4 dan4
to be afraid of the consequences; restraining fear

肆无忌惮 肆無忌憚 si4 wu2 ji4 dan4
absolutely unrestrained; unbridled; without the slightest scruple