Persistent

いつまでも続く

itsumademo tsudzuku

(indefinitely continuous)

しつこい

shitsukoi

(refusing to give up)

しつこい

shitsukoi

(insistently repetitive)

じぞくせいの

(indefinitely continuous)

不屈の

fukutsu no

(refusing to give up)

固執した

koshitsu shita

(refusing to give up)

執拗な

shitsuyō na

(insistently repetitive)

持続性の

jizokusei no

(indefinitely continuous)

長引く

nagabiku

(indefinitely continuous)

頑固な

ganko

(refusing to give up)