嘴比枪硬心比针软
[zuĭ bĭ qiāng yìng xīn bĭ zhēn ruăn]
嘴比枪硬心比针软 translates to 'Tongue Harder than a Gun but Heart Softer than a Needle’. This contrast between tough speech or stance and tender emotions indicates someone who appears tough or aggressive on the outside but is actually very sensitive or vulnerable inside.