L

[loud-mouthed] or [big-mouthed]  {adj.},  {slang}

Разговаривающий шумно, хвастливо или бессмысленно.

Fred was a loud-mouthed fellow, whose talk no one listened to.

* /If I were you, I would not listen to  […]

[louse up]  {v.},  {slang}

Приводить к разрушению или неразберихе; портить; проваливать.

* /When the man who was considering John's house heard that the basement was wet, that was enough to louse up the  […]

[low-key]  {adj.}

Расслабленный и беззаботный, спокойный.