adj. 25B6; adjective
a colourless liquid : UNCOLOURED, white, bleached; poetic/literary achromatic.
her colourless face : PALE, pallid, wan, anaemic, bloodless, ashen, white, waxen, pasty, peaky, sickly, drained, drawn, ghostly, deathly.
a colourless personality : UNINTERESTING, dull, boring, tedious, dry, dreary; unexciting, bland, weak, insipid, vapid, vacuous, feeble, wishy-washy, lame, lifeless, spiritless, anaemic, bloodless; nondescript, characterless.
colourful, rosy.