not allowed by law.
illegal
having mistakes or problems.
imperfect
unable to move.
immobile
Happening or done at different times that change often
irregular
not clear enough to read
illegible
to set in from the margin as a line of a paragraph
indent
not showing good judgement
illogical
not respectful or considerate
impolite
not thinking clearly.
Irrational
impossible to hear.
inaudible
not confident about oneself or your abilities.
insecure
not right or suited for some purpose or situation
Inappropriate
the condition of not being able to do something.
inability
not clear enough to read
illegible
not suitable for the situation.
improper