Synonyms of insist in English:

insist


See definition of insist

verb

1‘if they won't see you, be prepared to insist’

SYNONYMS
stand firm, be firm, stand one's ground, make a stand, stand up for oneself, be resolute, be determined, show determination, hold on, hold out, be emphatic, not take no for an answer, brook no refusal
persevere, persist, not give up, keep on at someone
informal stick to one's guns, stick it out, hang in there
ANTONYMS

give up

2‘Tom insisted that the fees be paid within thirty days’

SYNONYMS
demand, command, require, dictate
importune, entreat, urge, exhort

3‘he insisted that he knew nothing about the plot’

SYNONYMS
maintain, assert, hold, contend, argue, protest, claim, aver, avow, vow, swear, state, declare, announce, pronounce, proclaim, propound, be emphatic, emphasize, stress, repeat, reiterate
archaic avouch
rare asseverate, represent