nudnik NOOD-nik (“OO” as in “good”) (noun)
: a person who is a bore or nuisance

Example sentence:
“Sometimes he can be such a nudnik, always pestering me to go outside.” Did you know –
Nud originates in Yiddish from the word “nuda” meaning “boredom.” The suffix -nik ultimately came to English through Yiddish and Russian c. 1945 being popularized with the word sputnik. -nik is a common personal suffix meaning “person or thing associated with or involved in” (e.g. blognik “member of the blogisphere”).