[Idiom] a foul smell

[Ashiuhto]

Please check out the following sentences.

(1) Consequently, the conduit was clogged, and that caused a foul smell to make you sick.
(2) It was a gross to see the filthy and mess in teachers' washroom.

 

[Rover_KE]

Please check out the following sentences.

(1) Consequently, the conduit was clogged, and that caused a smell foul enough to make you sick.
(2) It was gross to see the filth and mess in the teachers' washroom.

Rover

 

[BobK]

And 'conduit' is a rather formal word, usually applying to pipes or housings that contain wires or cables - apart from the metaphorical use (=a means or route for communications). Use 'drain? 'Pipe' (if cylindrical)? Gutter (if open)?

b

 

[Tdol]

Also, here foul smell is literal not idiomatic.

 

[5jj]

'To make you sick' is not necessary.

 

[BobK]

'To make you sick' is not necessary.

I expect that's the reason Rover added the word 'enough'. The OP presumably wanted to emphasize how nauseating the smell was.

b