1. to be bad (various meanings)

a. to be bad; to be unpleasant; to be disagreeable; to be of inferior quality

b. to be bad; to be evil; to be ill-natured

c. to be bad, to be immoral

d. to be in the wrong; to be (morally) blamable

e. to be bad, to be harmful

f. to be bad; to be frail; to be weak

2. to be insufficient; to be inadequate (archaic, original meaning)