subliminal
sub.li.mi.nal \(.)s*b-'lim-*n-*l, 's*b-, -'li--m*n-\ \-e-\ aj [sub- + L limin-, limen threshold] 1: inadequate to produce a sensation or a perception 2: existing or functioning outside the area of conscious awareness {the ~ mind} {~ techniques in advertising} - sub.li.mi.nal.ly av