a. 非官方的, 非正式的

Inofficial \In"of*fi"cial\, a.
Not official; not having official sanction or authority;
unofficial; not according to the forms or ceremony of
official business; as, inofficial intelligence.

Pinckney and Marshall would not make inofficial visits
to discuss official business. --Pickering.

Syn: Private; informal; unwarranted; unauthorizod; irregular;
unceremonious; unprofessional.