形容詞 extraneous:

1. not pertinent to the matter under consideration
   同義詞：immaterial, impertinent, orthogonal
2. not essential
3. not belonging to that in which it is contained; introduced from an outside source
   同義詞：foreign
4. coming from the outside
   同義詞：external, outside

1. Extraneous material added to written work, such as a speech, to make it longer.
   冗詞贅句加在書(shū)面作品上的一些額外的材料，如一篇講話(huà)，為使之更長(zhǎng)一些

ex.tra.ne.ous

adj.（形容詞）
Not constituting a vital element or part.
枝節(jié)的：非主要的因素或部分的
Inessential or unrelated to the topic or matter at hand; irrelevant.See Synonyms at irrelevant
無(wú)關(guān)的：對(duì)主題或手頭的事情無(wú)關(guān)緊要的或無(wú)關(guān)的；沒(méi)有關(guān)系的參見(jiàn) irrelevant
Coming from the outside:
外來(lái)的：來(lái)自于外面的：
例句：
extraneous interference.See Synonyms at extrinsic
外界的影響參見(jiàn) extrinsic

來(lái)源：
From Latin extr3neus
源自 拉丁語(yǔ) extr3neus
from extr3 [outside] * see extra-
源自 extr3 [外面的] *參見(jiàn) extra-

【引伸】
extra.neously
adv.（副詞）
extra.neousness
n.（名詞）