| Word | Definitions | Synonyms |
|---|---|---|
| fast | (adverb) quickly or rapidly (often used as a combining form) | - |
| (adverb) firmly or closely | Synonyms: tight | |
| faster | (adverb) more quickly | Synonyms: quicker |
| fastest | (adverb) most quickly | Synonyms: quickest |
| fastidiously | (adverb) in a fastidious manner | - |
| (adverb) in a fastidious and painstaking manner | Synonyms: painstakingly |