How many phonemes are in the word thoughtfully?

Let's break down the word "thoughtfully" to count the phonemes:

* th - /θ/ (one phoneme)

* ou - /aʊ/ (one phoneme)

* gh - /t/ (one phoneme)

* t - /t/ (one phoneme)

* f - /f/ (one phoneme)

* u - /u/ (one phoneme)

* l - /l/ (one phoneme)

* y - /i/ (one phoneme)

Therefore, there are 8 phonemes in the word "thoughtfully".