執拗 しつよう
shitsuyō

na-Adjective

1. persistent; obstinate; tenacious; relentless; insistent; importunate; persevering; stubborn

彼女 かのじょ かれ執拗 しつようさにうんざりしていた。
kanojowa kareno shitsuyōsani unzari shite ita.
She was disgusted at his persistence.
Other forms: