KanjiJLPT N1
Peaceful

peaceful, calm, peace, easy, Thailand, extreme, excessive, great

Mnemonic

A deity cups its hands and lets a tiny splash of water fall onto a war-torn kingdom. Instantly, swords dissolve, soldiers embrace, and a vast peaceful calm blankets the land—one small splash of water from a deity changed everything forever.
Additional thoughts
Picture a serene, glowing deity gently releasing water from cupped hands—the droplets shimmer as they descend, and wherever they land, absolute tranquility spreads like ripples. The grandness of the deity matches the grand calm of 泰.
Quick recall
A deity's gentle splash of water brings peaceful calm to all.

Details

The keyword for 泰 is peaceful. This kanji conveys a sense of grand tranquility, stability, and calm composure. It carries connotations of greatness and safety, suggesting a state where all is well and secure. Historically, it has been associated with prosperity and smooth, untroubled conditions, as seen in its use in the name of Thailand (泰国) and in expressions describing serene, undisturbed states of being.
On'yomi
たい