From the given options choose the one that means the OPPOSITE of significant.

Concept

An antonym is a word whose meaning is opposite to that of another word. To find the antonym of a word, first fix its core sense, then look for the option whose sense is its direct negation — not a word that merely belongs to the same topic or repeats the same idea.

Application

The word “significant” means important, meaningful, or carrying weight and consequence. Its direct opposite is something that has no importance or no meaning at all. Among the choices, “meaningless” (having no meaning, of no importance) is exactly this negation, so it is the opposite of “significant.”

Contrast with the other choices

• “important” — a synonym of significant, not its opposite.

• “relevant” — means connected or pertinent; close in spirit to significant, again not an opposite.

• “outstanding” — means exceptionally notable, which reinforces the idea of being significant rather than negating it.

Only the choice meaning “without meaning or importance” reverses the sense of significant.