snuck up

• creptMoved slowly, furtively
• tiptoedWalked on foot-ends quietly
• stalkedFollowed stealthily with menace
• ambushedAttacked from concealment
• pouncedSuddenly jumped to attack

surprised · stealthy · silent · shadow · lurked · prowled · whispered · footsteps · behind · startled · ninja · cat · predator · hunting · quiet · careful · slow · approached