Its tone was the sinister note of The Shadow's voice.

Suddenly in the midst of this debauch a new and sinister note was introduced.

There was a sinister note of satisfaction in his father's voice that made Fish look up.

There was a vaguely sinister note in that voice.

There was a sinister note of doom in all that the avenger had said.

The door shut behind them with a sinister note of finality.

There was a sinister note in his voice.

The whispered voice carried a low, sinister note that could have been detected only by the man at the other end of the wire.

"Make no move -" There was a sinister note to the words.

The mirth carried a sinister note that they would understand.