Lumpy means covered with, or full of, small solid pieces. Lumpy sauce has bits in it that did not mix. A lumpy mattress has places that stick up, so you cannot lie flat. A lumpy bag of sugar has hard clumps from damp.

Lumpy結塊的、凹凸不平的 means covered with, or full of, small solid pieces意思是表面布滿，或裡面充滿了一塊塊固體。Lumpy sauceLumpy sauce（結塊的醬汁） has bits in it that did not mix裡面有沒有拌開的小塊。A lumpy mattress一個lumpy的床墊 has places that stick up有些地方會凸起來, so you cannot lie flat所以你沒辦法躺平。A lumpy bag of sugar一袋lumpy的糖 has hard clumps from damp因為受潮而結成硬塊。

The word is ordinary and a little informal — home, cooking, complaints about beds and roads.

The word is ordinary and a little informal這個字很普通，而且有點不正式 — home, cooking, complaints about beds and roads用在居家、烹飪，或抱怨床和路的時候。

Though actually, people stretch it: a lumpy path, lumpy progress, a lumpy year, meaning uneven, not smooth, with awkward bits sticking out.

Though actually不過其實, people stretch it大家也會把這個字延伸使用: a lumpy path, lumpy progress, a lumpy yeara lumpy path（顛簸的路）、lumpy progress（起伏不順的進展）、a lumpy year（顛簸的一年）, meaning uneven, not smooth, with awkward bits sticking out意思是不平順、不順暢，有些彆扭的地方冒出來。

In cooking it is often a fault (you wanted it smooth). On a sweater, lumpy might just mean thick and bumpy, not wrong.

In cooking在烹飪上, it is often a fault這常常是個缺點 (you wanted it smooth)（你原本希望它是滑順的）。On a sweater在毛衣上, lumpy might just mean thick and bumpylumpy可能只是指厚實、有點凹凸, not wrong不是什麼缺點。

It does not mean 'a lot of' or 'heavy', only that the surface or the mix is not even.

It does not mean 'a lot of' or 'heavy'它不代表「很多」或「很重」, only that the surface or the mix is not even只是指表面或混合物不均勻。