Antonyms for the phrase "deemed likely" include words such as doubtful, improbable, unlikely, uncertain, and unsure. These contrasting terms express a sense of uncertainty and disbelief, signifying the opposite of likelihood. Whereas "deemed likely" suggests a high probability of something happening, the antonyms suggest low probability or even impossibility. It's essential to choose the right antonym when conveying a message, as misusing them can lead to confusion or even misunderstandings. In everyday communication, people often use antonyms to emphasize their points or express their opinions when supporting or opposing an argument.