| Language | Reflex(es) | Gloss | Grammar | Sources |
|---|
| English |
| English | Fastred | personal name in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | Holfast | hobbit in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | Hamfast | hobbit name in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | avast | stop, cease, hold fast | vb.imp | AHD W7 LRC |
| English | Halfast | hobbit in Tolkien: The Lord of the Rings | prop.n | LRC |
| English | breakfast | first meal of day | n | AHD W7 LRC |
| English | fast | firm, snug, fixed, bound, secure | adj | AHD W7 LRC |
| English | fast | firmly, in fixed manner | adv | W7 LRC |
| English | fast | to abstain from food | vb.intrans | AHD W7 LRC |
| English | fasten | to affix, make fast | vb | AHD W7 LRC |
| English | handfast | contract, covenant | n.arch | AHD W7 LRC |
| English | shamefaced | bashful, showing modesty | adj | AHD W7 LRC |
| English | steadfast | firmly fixed in place | adj | AHD W7 LRC |
| Old English | fæst | fast | adj | W7 LRC |
| Old English | fæstan | to fast | vb | W7 LRC |
| Old English | fæste, feste | fast | adv | LRC |
| Old English | fæstnian, festnian | to fasten | vb.wk | W7 ASD LRC |
| Old English | scamfæst | shamefaced | adj | W7 LRC |
| Middle English | fast | fast | adj | W7 LRC |
| Middle English | fast(n)en | to fasten | vb | W7 LRC |
| Middle English | shamefast | shamefaced | adj | W7 LRC |
| West Germanic |
| Old Frisian | fest | fast | adj | ASD LRC |
| Old Frisian | festia | to fast | vb | ASD LRC |
| Old Frisian | festigia | to fasten | vb | ASD LRC |
| Frisian | fest | fast | adj | ASD LRC |
| Frisian | festgjen | to fasten | vb | ASD LRC |
| Middle Dutch | vast | fast | adj | AHD LRC |
| Dutch | vast | fast | adj | ASD LRC |
| Dutch | vasten | to fast | vb | ASD LRC |
| Dutch | vesten | to fasten | vb | ASD LRC |
| Old Saxon | fast | fast | adj | ASD LRC |
| Old Saxon | fest(i)an | to fasten | vb | ASD LRC |
| Old High German | fastēn | to fast | vb | ASD LRC |
| Old High German | fasti, festi | fast | adj | ASD LRC |
| Old High German | fastjan, festan | to fasten | vb | ASD LRC |
| Old High German | festinōn | to fasten | vb | W7 LRC |
| Middle High German | vast, veste | fast | adj | ASD LRC |
| Middle High German | vasten | to fast | vb | ASD LRC |
| Middle High German | vesten | to fasten | vb | ASD LRC |
| German | fasten | to fast | vb | ASD LRC |
| German | fest | fast | adj | ASD LRC |
| German | festen, befestigen | to fasten | vb | ASD LRC |
| North Germanic |
| Old Norse | fastr | fast; hard, severe; continuous | adj | LRC |
| Icelandic | fasta | to fast | vb | ASD LRC |
| Icelandic | festa | to fasten | vb | ASD LRC |
| Danish | fast | fast | adj | ASD LRC |
| Danish | faste | to fast | vb | ASD LRC |
| Danish | fæaste | to fasten | vb | ASD LRC |
| Swedish | fast | fast | adj | ASD LRC |
| Swedish | fasta | to fast | vb | ASD LRC |
| Swedish | fästa | to fasten | vb | ASD LRC |
| East Germanic |
| Gothic | fastan | to fast, fasten | vb | ASD LRC |
| Armenian |
| Armenian | hast | fast | adj | W7 HH LRC |