unmuffleredadj.
/(ˌ)ʌnˈmʌfləd/, U.S. /ˌənˈməflərd/ Chiefly U.S.
Of an engine or motor vehicle: not fitted with a muffler. Also occasionally of the driver or noise of such a vehicle.
ΚΠ
1914 R. Hughes What will People Say? xxxiv. 228 The Senator puffed like an unmufflered cut-out, and he frowned like a pirate, then he began to chuckle in the manner of a pirate ordering the plank put over the side.
1952 Lawrence (Kansas) Daily Jrnl.-World 13 Sept. 4/2 Pats on the back are due to those sympathetic officers who will run every unmufflered driver into court.
1956 Ada (Okla.) Evening News 21 May 1 Imagine what it would be like to live in a community where any or all of the small vehicles are allowed to gad about unmufflered.
1979 W. Stegner Recapitulation (1986) ii. 19 [He] turned eastward to see the mirage city rising against its mountains, and heard the ghostly unmufflered roar of Jack Bailey's bug.
2009 T. Wayman Woodstock Rising vi. 149 A perpetual din suffused the district: unmufflered car and truck engines throbbed by.
This is a new entry (OED Third Edition, December 2014; most recently modified version published online March 2022).
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adj.1914