candid
adj
not hiding one's thoughts; frank and honest 率直的; 坦白而诚实的
a candid opinion, statement, person 直言、 直说、 直性人
Let me be quite candid with you
your work is not good enough. 不瞒你说, 你的工作不怎麽好.
But can we blame those who looked and failed to see what Galileo saw, if we remember that to use a telescope at the limit of its powers calls for long experience and intimate familiarity with one's instrument?