Misuse of Unlike

The adjective unlike does not make sense if used before a singular noun, because it is used in comparisons; a different adjective (e.g. different, dissimilar, contradictory, opposite) should be used instead. However unlike may be used before plural nouns.

Some people would attempt to be polite, and describe her as “an unlike person”.

Unlike is inappropriate in this sentence because there is no comparison being made. It would be better to describe her as an unusual person, or a unique person.

Their unlike perspectives clash.

Because a comparison is being made between the two perspectives (a plural noun), unlike is appropriately used.

Remember that unlike can only modify a plural noun, so look for one in your sentence.