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extraneous
01
лишний
unnecessary or unrelated to the matter or subject at hand
02
посторонний
a bacillus bacterium that causes the plague; aerosolized bacteria can be used as a bioweapon
03
посторонний
not essential
04
внешний
not belonging to that in which it is contained; introduced from an outside source
Пример
ur professor seems like a person of few words, his lectures are concise without any extraneous details