Something that is not like something else; something different.
"After seeing his friend's new photo, he quickly hit unlike instead of commenting on it."
The act of withdrawing one's like from a post on social media.
"There was no real unlike in the two friends, and they got along perfectly."
To dislike.
"Unlike his brother, who loves spicy food, I can't stand anything hotter than mild salsa."
In plain English: To unlike someone means to stop liking them or to remove them from your list of people you enjoy being around.
"The two brothers are very different, unlike their parents who look almost identical."
Not like; dissimilar (to); having no resemblance.
"Unlike his calm demeanor during the crisis, Sarah was visibly shaking from head to toe."
In plain English: Unlike means being different from something else.
"Unlike many other sports cars, this model has four doors."
Usage: Unlike functions as a preposition or conjunction to introduce comparisons, not an adjective that modifies nouns directly. Use it before the item being compared rather than placing it after the subject with "as" or "like."
Differently from; not in a like or similar manner.
"Unlike her patient sister, my brother often loses his temper when things go wrong."
Unlike comes from Middle English and originally meant "different" or "dissimilar." While it is built from the prefix un- combined with like, its deeper roots lie in Proto-Germanic.