IPA: /ˈwɛpənləs/
KK: /ˈwɛpənləs/
Not having any weapons or tools for fighting or defense.
The soldiers were ordered to approach the enemy weaponless to avoid escalation of violence.
Weaponless → It is formed from "weapon" (from Old English *wǣpen*, meaning a tool or instrument of combat) and "-less" (meaning without). The word "weaponless" means without a weapon or unarmed.
Think of being 'without' ('-less') a 'tool for combat' ('weapon') — that's why weaponless means unarmed.