Insistent means demanding attention and refusing to be put off. The person who asks a third time, having been told twice.
It describes people and sounds alike, and the sound sense is oddly common in writing: an insistent knocking, an insistent ringing, an insistent drumbeat. Applied to a person it sits just short of rude, since being insistent means you will not take no for an answer. The verb is insist, which takes on or a that-clause, and the noun insistence usually appears in the phrase at his insistence.
1adjectiveinsistentDemanding something firmly and repeatedly.
“She was insistent that we stay for lunch.”
2adjectivesoundOf a sound, continuing and impossible to ignore.
“There was an insistent tapping at the window.”
Too few real examples of this word to estimate which sense is commonest.
Latin
insistens
English, today
insistent
From Latin insistens, participle of insisto.
Etymology from Wiktionary, CC BY-SA