The term ANNOYING SORT can be described by the following crossword solutions: GNAT (4 letters), GADFLY (6 letters), VEXER (5 letters), TWIT (4 letters), PAIN (4 letters), NUDNIK (6 letters), TWERP (5 letters), and NOODGE (6 letters). A GNAT is a small, annoying insect that buzzes around people's heads. A GADFLY is an annoying person who persistently criticizes or provokes others. A vexer is someone or something that causes annoyance or frustration. A TWIT is a silly or foolish person. A PAIN is someone who is irritating or difficult to deal with. A NUDNIK is a person who is annoying or bothersome. A TWERP is an insignificant or contemptible person. Finally, a NOODGE is someone who persistently nags or pesters another person.