"Gee, mine shattered the first time," Remo said in a dubious tone.

"Sounds like a real organized setup," said Richard in a dubious tone.

The drivers voice came back in a dubious tone.

"It's going to be a tough job, commissioner," declared the detective, in a dubious tone.

Despite Shastylt's dubious tone, the marshal closed the study door.

"If you say to," Hurthang agreed in a dubious tone.

There is a slightly dubious tone to that statement.

"It may mean a fight," remarked Fetzler, in a dubious tone.

There was so much he had still to remember; the thought came to him like a threat in Hilfe's dubious tones.

When the communications officer replied, it was with a dubious tone, as though he wasn't sure he could make that message ring true.