HSK 5
唯一
wéiyī形
only; sole
这是解决问题的唯一办法。
Zhè shì jiě jué wèn tí de wéi yī bàn fǎ.
This is the only way to solve the problem.
Say it
Hold the button, say it, then let go.
Other HSK words sharing a character
Also free:
New in the HSK 3.0 word list at level 5.