This is a problem that should not be 'taken lightly'. [=this is a problem that should be treated seriously]
Considering the harm he did, he's 'gotten off lightly' with only a warning.
Our troops were armed too 'lightly' to take on the heavily armed invaders.
(..) I don't even know who I'm talking to. If that's true, if you don't know who I am... then maybe your best course... would be to tread lightly. Sync and corrections by nt (..)2013 TvShow: Breaking Bad Title: Blood Money Season: 5 Episode 9