何も〜ない details

nothing + write + not

nani mo kakanai

nothing; not anything — 何 plus も under a negative predicate

meaning: not write anything

冷蔵庫れいぞうこ、何なにも入はいってないよ。買かい物もの行いこう。

reizouko, nani mo haittenai yo. kaimono ikou.

There's nothing in the fridge — let's go shopping. casual

朝あさからずっと忙いそがしくて、まだ何なにも食たべていません。

asa kara zutto isogashikute, mada nani mo tabete imasen.

I've been busy since morning and haven't eaten anything yet. neutral

Examples

nothing; not anything — 何 under a negative predicate denies every candidate at once, most often as the verb's object

冷蔵庫れいぞうこ、何なにも入はいってないよ。買かい物もの行いこう。

reizouko, nani mo haittenai yo. kaimono ikou.

There's nothing in the fridge — let's go shopping. casual

朝あさからずっと忙いそがしくて、まだ何なにも食たべていません。

asa kara zutto isogashikute, mada nani mo tabete imasen.

I've been busy since morning and haven't eaten anything yet. neutral

部屋へやには机つくえが一ひとつあるだけで、ほかには何なにもなかった。

heya ni wa tsukue ga hitotsu aru dake de, hoka ni wa nani mo nakatta.

There was just one desk in the room and nothing else. neutral

その件けんについては、まだ何なにも伺うかがっておりません。

sono ken ni tsuite wa, mada nani mo ukagatte orimasen.

I have not heard anything about that matter yet. formal

が and を both drop before も, but the other case particles survive it:
何なににも使つかわない, 何なにとも言いえない.

誰も〜ない
The same frame over a different question word, and they divide the world rather than compete — 何も ranges over things and 誰も over people, so 何なにも見みえない reports a view with nothing in it where 誰だれも見みえない reports one with nobody in it; neither takes the other's referent.
少しも〜ない
少しも denies the DEGREE of a predicate, so it scales any adjective (少すこしも痛いたくない); 何も denies an ARGUMENT, so it reaches an adjective only where that adjective has a thing to empty (何なにも悪わるくない) and never scales one — for a body part the question word is どこ rather than 何 (どこも痛いたくない, ×何なにも痛いたくない).
どこにも〜ない
何も denies the things a verb acts on, どこにも the places it happens in, and the two stack in one clause (どこにも何なにも置おいていない); where 何も needs the verb to have a thing to empty, どこにも needs it to have a location.

もしない
Identical も before a negative, different host — 何もしない takes the question word 何 and denies every possible act, while 見みもしない hangs も on one verb's masu-stem and denies that single expected act; a reader who parses 何もしない as the second reading loses the "at all" entirely.