不可磨灭

• 不(no; not; negation)ASSOCIATIVE

A bird flying swiftly upward and never willing to return represents the meaning of swift and unyielding.

• 口(mouth; opening)RADICAL
• 丁(man; adult male)PHONETIC

A mouth uttering words of approval with a sound like "ding" gives you the character meaning "can" or "able."

• 麻(thorny plant; coarse cloth)ASSOCIATIVE
• 石(stone; rock)RADICAL

Grinding stone processes thorny fibers into fine cloth — that is the meaning of the character.

• 氵(water; liquid)RADICAL
• 烕(extinguish fire; put out fire)PHONETIC

Using water to extinguish fire is a complete act of destruction.