形容詞 fictitious:

1. formed or conceived by the imagination
   同義詞：fabricated, fancied, fictional, invented, made-up
2. adopted in order to deceive
   同義詞：assumed, false, fictive, pretended, put on, sham

1. A fictitious name assumed by an author; a pen name.
   假名一個作者采用的假名; 筆名
2. Greeted me with a fictitious enthusiasm.
   用虛偽的熱情跟我打招呼

fic.ti.tious

adj.Abbr. fict.（形容詞）縮寫 fict.
Of, relating to, or characterized by fiction; imaginary.
虛構(gòu)的，想象的：屬于或關(guān)于虛構(gòu)的故事的，或以此為特征的；想象的

Accepted or assumed for the sake of convention:
傳統(tǒng)的：習(xí)慣上被接受了的或假定的：
例句：
a fictitious belief.
傳統(tǒng)的信仰

Adopted or assumed in order to deceive:
假的：為欺騙而采納或假定的：
例句：
a fictitious name.
假名

Not genuinely believed or felt; sham:
偽裝的：不是真地相信或感覺的；虛偽的：
例句：
greeted me with a fictitious enthusiasm.
用虛偽的熱情跟我打招呼

來源：
From Latin fictocius
源自 拉丁語 fictocius
from fictus [past participle of] fingere [to form] * see fiction
源自 fictus [] fingere的過去分詞 [形成] *參見 fiction

【引伸】
ficti.tiously
adv.（副詞）
ficti.tiousness
n.（名詞）