неграмотный – English translation

full of errors (in grammar. spelling, etc.)

illiterate (человек); unlearned; unlettered; analphabetic; letterless; unalphabeted; unbooked; unread; ignorant (Aly19); crude (о работе, рисунке и т.п.); inexpert (о работе, рисунке и т.п.); incompetent (e.g. manager Tanya Gesse); of little education; not versed (in); ungrammatical

Игорь Миг

ungrammatical (Meanwhile, in St. Petersburg the holiday is being celebrated with posters: Мы едины для мира – a strange, almost ungrammatical statement that is most likely a translation from the English: We’re united for peace. So a Christian saint on a secular holiday is no problem, and a bad Russian translation of an English slogan fits the bill. -– MBerdy (2016))

disappr.

inept (having or showing no skill; clumsy: Truss is way way out of her depth. She is worse than useless. I have no doubts they completely dismiss anything she says, and even their old asset Bunter is proving completely inept. -- проявил себя совершенно неграмотно