Synonyms for "barely":
* Almost not: This emphasizes the nearness to not happening.
* Hardly: This emphasizes the difficulty of the action.
* Scarcely: This emphasizes the small amount or extent.
* Just: This emphasizes the minimal amount needed.
* With difficulty: This emphasizes the effort required.
* With effort: Similar to "with difficulty".
* By a hair's breadth: This emphasizes the narrow margin.
Antonyms for "barely":
* Easily: This emphasizes the lack of difficulty.
* Readily: This emphasizes the willingness or promptness.
* Abundantly: This emphasizes a large amount or extent.
* Fully: This emphasizes the completeness of the action.
* Completely: Similar to "fully".
* Amply: This emphasizes the sufficiency of the amount.
The best synonym or antonym depends on the specific context of the sentence.