'Dim' is the antonym of 'bright', referring to a lack of light or brightness.

'Deceitful' is the opposite of 'Candid', which means truthful and straightforward.

'Selfish' is the antonym of 'generous', referring to someone who is not willing to share or give.

'Weak' is the antonym of 'strong', indicating a lack of strength or power.

'Important' is the opposite of 'Trivial', which means of little value or importance.

'Kind' is synonymous with 'Benevolent', which means well-meaning and kindly.

'Courageous' is a synonym of 'brave', both describing someone who shows courage.

'Challenging' is a synonym of 'difficult', as both imply something that requires effort to overcome.

'Weak' is synonymous with 'Fragile', indicating something that is easily broken.

'Unknown' is synonymous with 'Obscure', meaning not well known or unclear.

'Ancient' is a synonym of 'old', both referring to something that has existed for a long time.

'Fast' is a synonym of 'quick', both meaning moving or capable of moving at high speed.

'Expansive' means covering a wide area, which is synonymous with 'Vast'.