Antonyms of adj tranquil

2 senses of tranquil

Sense 1
placid, quiet, still, tranquil, smooth, unruffled -- ((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")

INDIRECT (VIA calm) -> stormy -- ((especially of weather) affected or characterized by storms or commotion; "a stormy day"; "wide and stormy seas")

Sense 2
calm, unagitated, serene, tranquil -- (not agitated; without losing self-possession; "spoke in a calm voice"; "remained calm throughout the uproar"; "he remained serene in the midst of turbulence"; "a serene expression on her face"; "she became more tranquil"; "tranquil life in the country")

INDIRECT (VIA composed) -> discomposed -- (having your composure disturbed; "looked about with a wandering and discomposed air")

Similarity of adj tranquil

2 senses of tranquil

Sense 1
placid, quiet, still, tranquil, smooth, unruffled -- ((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")
       => calm (vs. stormy) -- ((of weather) free from storm or wind; "calm seas")

Sense 2
calm, unagitated, serene, tranquil -- (not agitated; without losing self-possession; "spoke in a calm voice"; "remained calm throughout the uproar"; "he remained serene in the midst of turbulence"; "a serene expression on her face"; "she became more tranquil"; "tranquil life in the country")
       => composed (vs. discomposed) -- (serenely self-possessed and free from agitation especially in times of stress; "the performer seemed completely composed as she stepped onto the stage"; "I felt calm and more composed than I had in a long time")