nechikoi

persistent; stubborn; sticky

Word type: I-adjectives

Standard: しつこい／ねばっている

Standard kanji: しつこい／粘っている

Example:

あの人、ねちこい性格やなあ。まだあの事言うてんのか。
She just doesn't stop--is she still talking about that?

Commentary:

When you want to emphasize more, use ねちっこい.