Poorly written means that the text is written bad, like with spelling or grammatical mistakes.
The effect of poorly packed will decrease the melting point.
Something that is written.
Poorly, but with practice I am hoping to improve.
the plumbing drain vent is not installed or poorly installed.
Vague is French for ocean wave, from the Latin vagusmeaning 'wandering'. Insofar as any individual wave is indistinct, changeable and transient, vague has come to mean poorly defined, indefinite and incompletely known or understood.