我本可以去健身房——只是懒惰阻止了我。

I could go to the gym - it's just ___laziness that stops me.

抱歉之前没给你写信——真的没有借口，只是懒惰。

Sorry I haven't dropped you a line before now - no excuses really, just ___laziness.

她的懒惰常常导致错失良机。

Her ___laziness often leads to missed opportunities.