delusion

名词 delusion:

1. (psychology) an erroneous belief that is held in the face of evidence to the contrary
   同义词：psychotic belief
2. a mistaken or unfounded opinion or idea
   同义词：hallucination
3. the act of deluding; deception by creating illusory ideas
   同义词：illusion, head game

1. He labours under the delusion that he's a fine actor.
   他有个错觉，以为自己是个好演员。
2. Your hope of promotion is a mere delusion.
   你提升的希望只不过是一种幻觉。
3. His arguments sound convincing but they're based on delusion.
   他的论据听起来似乎有理，但根本上是欺骗性的。

de.lu.sion

n.（名词）

The act or process of deluding.
欺骗，骗局：欺骗人的行为或过程
The state of being deluded.
受骗：被欺骗的状态
A false belief or opinion:
错觉，幻觉：虚假的信念或观点：
例句：
labored under the delusion that success was at hand.
误以为成功垂手可得而苦恼

Psychiatry A false belief strongly held in spite of invalidating evidence, especially as a symptom of mental illness:
【精神病学】 妄想症：一种强烈的虚幻的信念，即使有使之无效的证据也毫不动摇，特指一种精神病症状：
例句：
delusions of persecution.
迫害幻想症

来源：
Middle English delusioun
中古英语 delusioun
from Latin dôlôsiô dôlôsiôn-
源自 拉丁语 dôlôsiô dôlôsiôn-
from dôlôsus [past participle of] dôlôdere [to delude] * see delude
源自 dôlôsus [] dôlôdere的过去分词 [欺骗，迷惑] *参见 delude

【引伸】
delu.sional
adj.（形容词）