Adj., describing a person who is complaining about everyone and everything all the time. Felicious is not gradable because it is the superlative of being annoying: annoying, more annoying, most annoying, felicious.
Did you talk to this girl last night? She was complaining about the staff all the time? She was so felicious!
v. combination of feline and malicious. Uses your cat for a companion, but then shuts them in your room while you are sleeping when they become hungry, etc.
It was very felicious of my sister to close the door on my cat so that she would wake me instead of feeding the cat herself.