From (rare) Middle Dutch vertwîvelen, most likely a calque of Middle High German verzwīveln (12th c., whence modern verzweifeln). By surface analysis, ver- + twijfelen (“to doubt”).
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vertwijfelen
| Conjugation of vertwijfelen (weak, prefixed) | ||||
|---|---|---|---|---|
| infinitive | vertwijfelen | |||
| past singular | vertwijfelde | |||
| past participle | vertwijfeld | |||
| infinitive | vertwijfelen | |||
| gerund | vertwijfelen n | |||
| present tense | past tense | |||
| 1st person singular | vertwijfel | vertwijfelde | ||
| 2nd person sing. (jij) | vertwijfelt, vertwijfel2 | vertwijfelde | ||
| 2nd person sing. (u) | vertwijfelt | vertwijfelde | ||
| 2nd person sing. (gij) | vertwijfelt | vertwijfelde | ||
| 3rd person singular | vertwijfelt | vertwijfelde | ||
| plural | vertwijfelen | vertwijfelden | ||
| subjunctive sing.1 | vertwijfele | vertwijfelde | ||
| subjunctive plur.1 | vertwijfelen | vertwijfelden | ||
| imperative sing. | vertwijfel | |||
| imperative plur.1 | vertwijfelt | |||
| participles | vertwijfelend | vertwijfeld | ||
| 1) Archaic. 2) In case of inversion. | ||||