任何
rènhé · HSK 3
det.: any
任 (rèn, to allow/any) + 何 (hé, what) = any what = anything
任 means to allow or appoint, here extending to 'any'; 何 is the classical word for 'what'. Together 任何 literally reads 'any what', i.e. 'whatever, any at all'. Common in negatives: 没有任何理由 = no reason whatsoever.
任 — person radical 亻 + 壬 (phonetic)
任 combines the person radical 亻 with 壬, which supplies the sound. The original sense centered on a person bearing a load or burden, which extended naturally to 'carrying responsibility,' 'duty,' and 'to appoint someone to a post.' Modern uses like 任务 (task) and 责任 (responsibility) preserve this core idea.