As a Noun:
1. A person who is physically weak. English = weakling.
As a Verb or Adjective:
1. To not have very much strength or energy. English = (be) weak, (be) frail.
2. Of a person, to be easily influenced by other people. English = (be) weak.
3. To have drunk so much alcohol that you cannot stand up properly, speak clearly or behave sensibly. English = (be) drunk. Idiomatic English = (be) blind drunk. Formal English = (be) inebriated, (be) intoxicated.