Belligerent

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late 16th century: from Latin belligerant- ‘waging war’, from the verb belligerare, from bellum ‘war’.

wiktionary

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From Latin belligerans(“waging war”), present active participle of belligerō(“I wage war”), from belliger(“waging war, warlike”), from bellum(“war”) + -ger (from gerō(“I lead, wage, carry on”)).

etymonline

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belligerent (adj.)

1570s, "waging war, engaged in hostilities," from Latin belligerantem (nominative belligerans), past participle of belligerare "to wage war," from bellum "war" (see bellicose) + gerere "to bear, to carry" (see gest). The noun meaning "party or nation at war" is from 1811. Related: Belligerently.