KanjiJLPT N1
Discreet

discreet, reverently, humbly

Mnemonic

To be discreet, choose your words as carefully as a sunflower tracks the sun—silently, without fanfare. The sunflower never announces its slow turning; it simply faces the light with quiet dignity. Let your words carry that same restrained, respectful grace.
Additional thoughts
A sunflower's movement is so subtle you barely notice—perfect symbol for discretion. Pair that silent turning with carefully measured words, and you get humble, proper speech that never draws unwanted attention.
Quick recall
Let your words move like a sunflower—silently, with discreet grace.

Details

The keyword for 謹 is discreet. This kanji conveys the idea of being careful, respectful, and restrained in one's words and behavior. It carries a sense of humble prudence, suggesting that one exercises caution and propriety in how they express themselves. The character is often associated with formal politeness, solemnity, and a conscientious attitude toward social conduct.
On'yomi
きん
Kun'yomi
つつし.む