The pronunciation of the word "thoughtful".

[Hansman]

thoughtful [ˈθɔːtfl ]

Is the [t] sound a silent t like listen or a glottal stop t like mountain?

How does it sound to you?

 

[Rover_KE]

For me, it's silent in thoughtful but definitely not in mountain.

 

[5jj]

For me, it's an alveolar stop (unexploded) in both words.

 

[jutfrank]

For me, it's silent in thoughtful but definitely not in mountain.

It's not exactly silent in 'thoughtful' but yes, it isn't pronounced as a /t/ but rather as a glottal stop. In 'listen', it's completely silent. In 'mountain' it's pronounced as a /t/ (in standard RP).

 

[Skrej]

It's a definite hard alveolar stop for me. There's no difference (to me) between 'thought' and 'thoughtful'.