Insists

[in-sist] /ɪnˈsɪst/

verb (used without object)
1.
to be emphatic, firm, or resolute on some matter of desire, demand, intention, etc.:
He insists on checking every shipment.
2.
to lay emphasis in assertion:
to insist on the justice of a claim.
3.
to dwell with earnestness or emphasis (usually followed by on or upon):
to insist on a point in a discussion.
verb (used with object)
4.
to assert or maintain firmly:
He insists that he saw the ghosts.
5.
to demand or persist in demanding:
I insist that you see this thing through.
/ɪnˈsɪst/
verb
1.
to make a determined demand (for): he insisted that his rights be respected, he insisted on his rights
2.
to express a convinced belief (in) or assertion (of): he insisted that she was mad, he insisted on her madness
v.

1580s, from Latin insistere “persist, dwell upon, stand upon,” from in- “upon” (see in- (2)) + sistere “take a stand” (see assist). Perhaps in some cases a back-formation from insistence. Related: Insisted; insisting.