can't help; cannot but
不 · 4 strokes
Pictograph of sepals of a flower. The modern meaning "no" is a phonetic loan.
由 · 5 strokes
Depicts a kind of helmet worn by warriors. Based on the original meaning "helmet", now written as 胄. The current meaning is a phonetic loan.
得 · 11 strokes
Depicts a hand (寸) grabbing a shell (貝), used as currency in ancient China, to convey the meaning "get". Originally written as 㝵. The 彳 (movement) component was added later.