The answer is RASH, four letters. Both words describe acting before thinking, and RASH is the short, plain fill for this clue. Five squares open up HASTY, BRASH and HEADY, while longer slots can take HEADLONG, HOTHEADED or the ten-letter HALFCOCKED.
An attack hidden inside impetuous
Impetuous was a word about force before it was a word about character. Its earliest English sense, from the late 1300s, was hot-tempered or fierce, and by the late 1400s it could describe anything done with a rush of force. The source is Late Latin impetuosus, built on impetus, an attack, from the verb impetere, to attack, which joins in-, upon, to petere, to aim for or rush at.
Petere turns up elsewhere in English. Compete comes from Latin competere, to strive together, with the same verb inside it, and petulant goes back to Latin petulans, wanton or insolent, which is related to it. Impetuous describes a charge rather than a mood, which is why speed words such as HASTY and HEADLONG sit beside RASH in the answer list.
Rash once meant quick on your feet
When RASH first shows up, in the late 1300s, it was close to a compliment. It meant nimble, quick or vigorous, possibly a survival of an Old English element seen in a compound meaning a flash of lightning. The modern sense, reckless and heedless of consequences, took hold around 1500, and the original meaning has since fallen out of use.
The skin rash is a separate word that arrived in 1709, perhaps from French rache, a sore, and ultimately connected to Latin radere, to scrape. The two share nothing but their spelling. If a clue mentions skin, itching or a sudden outbreak, it wants the noun, and the impetuous sense is off the table.
Fills for impetuous, four squares to ten
Count the squares, then run this list:
| Letters | Answer | What triggers it |
|---|---|---|
| 4 | RASH | The default short fill |
| 5 | HASTY | Speed is the main idea |
| 5 | BRASH | Boldness with some cheek |
| 5 | HEADY | The older headstrong sense |
| 5 | FIERY | Passion more than speed |
| 6 | MADCAP | Wild, reckless behavior |
| 7 | FLIGHTY | Changeable, easily carried off |
| 8 | HEADLONG | Headfirst, without a pause |
| 8 | VEHEMENT | Force of feeling |
| 9 | HOTHEADED | Temper as well as haste |
| 9 | FOOLHARDY | Bold without judgment |
| 9 | OVEREAGER | Too keen to wait |
| 10 | HALFCOCKED | Acting before you are ready |
Why HASTY, HEADY and BRASH make a five-square trap
Five squares gives you three strong candidates, and two of them share their outside letters. HASTY and HEADY both start with H and end with Y, so the middle three squares do all the work: A, S and T against E, A and D. HEADY looks like the odd one out because the word is familiar as intoxicating, but its first sense in the late 1300s was headstrong, hasty and impetuous, and the sense of going to the head only appears in the 1570s.
BRASH is easier to spot, because its last four squares spell RASH exactly. It is also much younger, first recorded in 1824 in the sense impetuous, rash or hasty in temper, and its origin is uncertain. If RASH is penciled into a slot and the crossings keep fighting it, check whether the grid has really given you five squares.
The head keeps turning up in these answers
Look down the answer list and the head appears again and again. HEADLONG began in the late 1300s as headling, head plus an adverb ending, and around 1400 it was reshaped to match words like sidelong. MADCAP, from the 1580s, pairs mad with cap used figuratively for the head. HOTHEADED and HEADY make the point without any disguise.
HALFCOCKED borrows from firearms instead. A gun at half cock had its hammer lifted only to the first catch, where the trigger does not act, and that literal sense is on record by 1750. Going off half-cocked, meaning speaking or acting too hastily, followed by 1833, in allusion to guns firing prematurely. FOOLHARDY, from the mid-1200s, is plainer: fool plus an Old French word for bold, so foolishly brave.
