significant

Important or large enough to deserve attention.

• There was a significant change.
• The new road brought significant benefits.
• Did the treatment make a significant difference?

Similar words: important, major, considerable

Opposites: insignificant

Common phrases: significant change, significant difference, significant amount, significant effect

Showing a message or feeling without saying it directly.

• She gave him a significant look.
• Their significant silence suggested they knew the truth.
• He exchanged a significant glance with his sister.

Similar words: meaningful, telling

Opposites: meaningless

Common phrases: significant look, significant glance, significant silence