Which of the 26 English letters is the dumbest?

It's F, because the first letter of fool is F, which means fool.

This letter was invented by Etruscans. In Etruscan, the pronunciation of f is the same as that of /w/ in Greek (and the letter called Digamma in Greek disappears because this phoneme disappears in Greek). The prototype of F is the letter W,&; Acircw, it also attacked /w/, which may provide a clue.

Extended data:

The 27 letters of Old English are as follows:

Answer? b c d？ For example: h i l m n o p r s t x y

And k is rarely used. q，？ V and z, without the letters j and u.

Medieval, letters? Replace it with w; ? It was replaced by a, but it was still retained in the later international phonetic symbols; ? And then what? It was replaced by the th word group, but the former was preserved in later international phonetic symbols.

Baidu encyclopedia-English letters