2286: wrath + -th = wroth...? Mar 20, 2021

'Wrath' and 'wroth' are obviously related, both in meaning and spelling, but not in the way one might assume upon first glance. Rather than being variants in the way 'swim-swam-swum' or 'raise-rise' are with internal vowel change, the Old English for 'wrath' was 'wrǣþþu', equivalent to 'wroth' plus '-th': the same suffix in 'warm-warmth'. 'Wroth' therefore was originally an adjective (Old English: wrāþ; Middle English: wrað), roughly synonymous with 'cruel'. These two are not immediately related to 'wreath', 'writhe', or 'wry' (each related to the others) though many like to connect the sense of twisting to that of anger, in a similar way to what happened with 'wrong' and 'worry'.