Словарь

redundant

Прилагательное

Пример: “Several steps in the process were redundant and removed.”

redundantly

Наречие

Пример: “The idea was expressed redundantly several times.”

Синонимы: repetitively, superfluously

Антонимы: succinctly, economically

superfluous

Прилагательное

Пример: “Most of the explanation was superfluous.”

Синонимы: unnecessary, redundant

Антонимы: essential, necessary