Lifeless means lacking energy, vitality, or any signs of life. A lifeless houseplant has withered brown leaves and won't grow no matter how much you water it. A lifeless performance by an actor feels flat and unconvincing, as if they're just reciting lines without emotion or energy.

The word can describe things that were once alive but have died: a lifeless tree struck by lightning. But it also describes things that feel dull, empty, or devoid of energy even though they were never technically alive. A lifeless party might have guests standing around awkwardly with nothing interesting happening. A lifeless essay uses boring words and weak sentences that fail to engage the reader.

When something is lifeless, it's missing the spark or vitality that makes it interesting, exciting, or worth paying attention to. The opposite of lifeless is lively, vibrant, or animated. A good writer transforms lifeless prose into vivid descriptions that make readers see, feel, and care about what's happening on the page.