big and burdensome;large but impractical; unwieldy ? 你制訂的計(jì)劃～，無法付諸實(shí)施。The plan you’ve worked out is large but impractical. Therefore it can’t be carried out.
大而無當(dāng)dà ér wú dànɡ
當(dāng)：底。表示雖然很大，但不實(shí)用。large but impractical, big and burdensome, unwieldy