- There's nothing worse than doing things by halves!!
- There is nothing worse than doing something in a half-hearted manner.
- The worst thing you can do is to only do something half seriously.
- Doing something only half-heartedly is the worst thing you can do.
- Leaving something unfinished is the worst thing you can do.
- Non c'è niente di peggio che fare le cose a metà.
- Non c'è niente di peggio che lasciare le cose fatte a metà.