to be completely unaware or uncertain about something
From the use of the word fog to mean a vague notion or idea, first recorded in the 1880s. The original sense was to not have the smallest idea or notion about something.
I haven’t the foggiest idea what he’s talking about.
We still don’t have the foggiest idea who did it.
To start learning English, first sign up to Fluency > choose your language > and being speaking!

Fluency is focused on the most essential aspect of language learning, SPEAKING! Our AI tutor allows you to speak, engage and interact in a customizable manner in English.

Fluency has support for more than 20 languages. We know English is the most popular language to learn, but we support a whole world of language learning too!

Comprehension comes from listening and responding. We know an easy path to learning is watching videos in English, for our Fluency+ users we support video translation so you can double check if you understood that video right.

Fluency includes course work that will take you from beginner to advanced as an English speaker. We focus on reading, writing, speaking and most of all learning English!

Fluency's learning model is based off the interaction methodology proposed by linguist Michael Long.

Throughout your language learning journey we will test you and help identify weaknesses and strength in your language skills you so will know where to improve.
Learn to speak English with Fluency, the only language learning service designed to help you speak!