(informal) "not knowing even a millimeter": completely ignorant in regards to something

British Indian Ocean Territory (an archipelago and overseas territory of the United Kingdom in the Indian Ocean)

British Antarctic Territory (an overseas territory in the Antarctic administered by the United Kingdom, and also including the South Orkney Islands and South Shetland Islands)

(Buddhism) think on the power of Kannon

expert, skillful man

(music) performer, player

coward

beginner (someone who has recently begun learning something new) / (Internet slang) noob

candidate (a person who is running in an election or who is applying to a position for a job)

producer, manufacturer