un-
Some prefixes that go with "conscious" are "sub-" and "un-." For example, "subconscious" and "unconscious."
The opposite word of significant using prefixes would be "insignificant."
Unfashionable.
Some common prefixes that create antonyms are "un-", "dis-", "in-", "im-", "non-", and "a-". Adding these prefixes to words can change their meaning to the opposite.
un
Some prefixes that go with "conscious" are "sub-" and "un-." For example, "subconscious" and "unconscious."
The opposite word of significant using prefixes would be "insignificant."
You can be unconscious or you can listen to your subconscious mind.
Counter
Unfashionable.
Some common prefixes that create antonyms are "un-", "dis-", "in-", "im-", "non-", and "a-". Adding these prefixes to words can change their meaning to the opposite.
Both of does prefixes mean not. In this case, these prefixes make words the opposite of what they mean.
un-
un
The prefixes il, im, and ir all mean "not" or "opposite of." They are used to negate the meaning of the base word that follows them.
inpolite
The opposite of mechanical (by machine) could be biological or natural.The opposite of mechanical (perfunctory, without thought) could be conscious, considered, or thoughtful.Where mechanical has the connotation automatic, the opposite would be manual.