What does frighteningly mean?
Frighteningly is an adverb meaning 'to a frightening degree'. It typically modifies an adjective or adverb to signal that some quality — size, speed, frequency, similarity, or skill — reaches a level that alarms, shocks, or unsettles the observer: a cliff may be frighteningly steep, a disease frighteningly contagious, a bill frighteningly large. Because it expresses intensity through fear, it naturally carries negative or ominous connotations, yet English speakers also deploy it hyperbolically for admiration, praising a colleague as 'frighteningly intelligent' or a performance as 'frighteningly good'. In these uses the word conveys that something is so extreme it borders on unsettling, even when the extremity is welcome. Derived from the verb 'frighten', which traces back through Middle English to Old English roots related to fright, frighteningly is a transparent formation: the adjective 'frightening' converted to adverbial use with the -ly suffix. It is standard throughout the English-speaking world and appears freely in journalism, commentary, and conversation alike.
adverbTo a frightening or alarming degree; used to intensify the description of something that causes fear, shock, or dismay.
- Used to indicate that something possesses a quality — such as size, speed, skill, or frequency — to a degree that is alarming, shocking, or intimidating.
- Used more loosely as an intensifier meaning 'to a strikingly extreme degree', even when the thing described is impressive rather than fearsome.
"The road narrowed to a frighteningly steep descent with no guardrail."
"Unemployment in the region has risen to frighteningly high levels."
"For someone so young, she was a frighteningly accomplished pianist."
It can describe both horror and delight — a price can be frighteningly high and a talent frighteningly good.
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Etymology of frighteningly
Frighteningly derives from 'frightening', the present participle of the verb 'frighten', combined with the adverbial suffix '-ly'. The verb 'frighten' comes from the noun 'fright', which descends from Middle English 'frighte' or 'frigte', itself rooted in Old English 'fyrhto' (fear), related to Germanic forms such as Old Saxon 'forhta' and sharing distant origins with Latin 'pavor'-type fear terms through Proto-Germanic ancestry. The adverb emerged as English speakers sought a way to express degrees of fearfulness, following the productive pattern by which participial adjectives take '-ly' to form adverbs (as with 'surprisingly' and 'alarmingly'). Cognate expressions of the same root include 'frightful' and 'frightened'.
Related word forms
How frighteningly is actually used
Frighteningly is an intensified form of the adjective 'frightening', most often placed directly before the word it modifies (e.g. 'frighteningly thin', 'frighteningly quiet'). It carries an inherently negative or alarming connotation, though it is frequently used hyperbolically or admiringly for things that are impressively extreme, as in 'frighteningly smart'. It is neutral in register, appearing in both everyday journalism and formal writing, and is equally at home in British and American usage.
Easily confused with frighteningly
Frightfully means to an extreme or very great degree (often in the sense 'very' or 'extremely'), whereas frighteningly specifically conveys that something is frightening or alarming in its degree.