late 14c., "existing only in imagination," from Middle French fantastique (14c.), from Medieval Latin fantasticus, from Late Latin phantasticus "imaginary," from Greek phantastikos "able to imagine," from phantazein "make visible" (middle voice phantazesthai "picture to oneself"); see phantasm. Trivial sense of "wonderful, marvelous" recorded by 1938. Old French had a different adjective form, fantasieus "weird; insane; make-believe." Medieval Latin also used fantasticus as a noun, "a lunatic," and Shakespeare and his contemporaries had it in Italian form fantastico "one who acts ridiculously."
中文解释
1、fant- + -ast + -ic.2、其实也就是看得见摸不着的东西，也就是很虚幻、很梦幻的东西。3、其词根的原始含义为：visible, appear. => only image or picture, picture to oneself, imagine.4、由此，该词的含义就很明确了：幻想，空想，狂想，白日梦；错觉，幻觉；怪念头，想入非非。5、想象的、幻想的东西肯定是不现实的，但他肯定是完美的、理想的、很奇特的、很不可思议的。由此有了新的引申义。
实用例句
1. I got a fantastic new job and my salary tripled.
我得到了一份非常好的新工作，薪水涨到了原来的3倍。
来自柯林斯例句
2. "You're coming?" he said excitedly. "That's fantastic! That's incredible!"
“你要来么？”他激动地说，“那太好了！简直难以置信！”
来自柯林斯例句
3. My mother, who had a sheltered upbringing, has fantastic memories of childhood.
我妈妈在呵护下长大，对童年有着非常美好的回忆。
来自柯林斯例句
4. There would be a fantastic welcome awaiting him back here.
为了迎接他回来，这里将举行一个热烈的欢迎仪式。
来自柯林斯例句
5. It suddenly clicked that this was fantastic fun.