The drumbeat and synth bass are as insistent as they are ominous.
The mood on the ground that day was determined, but not defiant; insistent but not angry.
It goes, “The day is short, the task is great, the master is insistent.”
1620s, "standing on something," from Latin insistentem (nominative insistens), present participle of insistere (see insist). Meaning "dwelling firmly on something asserted" is from 1868. Related: Insistently.