ˈɛk.wə.bəl ˈplæs.ɪd ˈkwaɪ.ɪt smuːð ˈtɹæŋ.kwɪl (of a body of water) free from disturbance by heavy waves a ribbon of sand between the angry sea and the placid bay the quiet waters of a lagoon a lake of tranquil blue water reflecting a tranquil blue sky a smooth channel crossing scarcely a ripple on the still water unruffled water not easily irritated an equable temper not everyone shared his placid temperament remained placid despite the repeated delays