一点儿也不 / 一点儿都不【yìdiǎnr yě bù / yìdiǎnr dōu bù】

一点儿也不 turns "not" into "not at all". The order is fixed: 一点儿, then 也 or 都, then 不 or 没, then the adjective or verb. 也 and 都 mean the same here.

不 or 没

不 goes with adjectives and with what someone wants, likes or usually does. 没 goes with something that didn't happen.

With a noun

A noun goes between 一点儿 and 也: "not a bit of anything".

Word order mistakes

The whole phrase sits before the verb or adjective. English puts "at all" at the end; this pattern doesn't.

• × 我不累一点儿 → 我一点儿也不累
• × 我不一点儿累 → 我一点儿也不累
• × 我也一点儿不累 → 我一点儿也不累

Much stronger than 不太

不太 is "not very", a soft no. 一点儿也不 is a flat no.