Exploring the Meaning of Achlus in Greek

ἀχλύς means “mist” and appears in Acts in the account of a sudden, divinely imposed blindness. In its lone New Testament occurrence, the word helps depict a physical, immediate obscuring of sight that accompanies “darkness.”

Occurrences

“Now, behold, the hand of the Lord is on you, and you will be blind, not seeing the sun for a season!” Immediately a mist and darkness fell on him. He went around seeking someone to lead him by the hand. (Acts 13:11)

In Acts 13:11, ἀχλύς belongs to a tightly packed description of judgment expressed as loss of vision. The spoken declaration sets the terms: “you will be blind, not seeing the sun for a season!” The narrative then reports the fulfillment “Immediately,” and ἀχλύς is paired with “darkness” as what “fell on him.” In this scene, “mist” is not a distant atmospheric detail but a sudden condition that comes upon a person and directly affects perception. The clause “a mist and darkness fell on him” presents the impairment as external, enveloping, and imposed, matching the preceding line, “the hand of the Lord is on you.”

The surrounding wording also clarifies how ἀχλύς functions: it is linked with the inability “not seeing the sun,” and its practical effect is shown in the final sentence: “He went around seeking someone to lead him by the hand.” The “mist” therefore participates in a concrete chain of cause and effect within the verse—pronouncement, immediate onset (“Immediately”), sensory deprivation (mist with darkness), and the resulting dependence on guidance. In the flow of the account, ἀχλύς helps the reader picture blindness not as an abstract statement alone but as a palpable obscuring that accompanies “darkness” and leads to physical disorientation.

Sense and Usage

As “mist,” ἀχλύς conveys an obstruction that reduces clarity and visibility. In Acts 13:11 it is presented as something that can “fall” upon someone, a verb choice that frames the phenomenon as descending and covering rather than merely being present in the environment. The addition of “darkness” beside it intensifies the description: the verse does not depict a mild haze but an enveloping obscurity sufficient to make someone “blind” and unable to see even “the sun.” Within the single attested context, ἀχλύς serves the narrative by giving texture to the experience of sudden blindness—something like a veil of obscuration that comes down over the person’s sight.

The verse also places ἀχλύς inside a temporal frame: “not seeing the sun for a season.” That phrase defines the blindness as lasting for a limited period, and the immediate onset of “mist and darkness” supplies the sensory image of how such a season begins. The word thus works at the junction of divine agency (“the hand of the Lord is on you”), bodily consequence (“you will be blind”), and visible manifestation (“a mist and darkness fell on him”). The scene does not treat “mist” as mere weather; it is a tangible sign accompanying the affliction and explaining why the person must seek someone “to lead him by the hand.”

Because ἀχλύς occurs here in conjunction with “darkness,” its contribution is best read as complementary: “mist” suggests obscuring, and “darkness” underscores the totality of what has happened to his ability to see. Together they present blindness as both a loss of light and a covering that blocks perception. The result is immediately practical: the affected person moves about (“He went around”) but cannot navigate without help, highlighting how the “mist” is not simply a visual metaphor but part of an embodied experience described in ordinary terms.

Imagery

The imagery of ἀχλύς in Acts 13:11 is vivid because it is both sudden and personal: it “fell on him.” The verse invites the reader to imagine sight being overtaken—first by “mist,” then by “darkness”—so that even the most basic marker of daytime, “the sun,” is inaccessible. The closing detail, “seeking someone to lead him by the hand,” anchors the imagery in a human posture of dependence: the obscuring “mist” is not only seen but felt in the way it forces a person to move through the world.

Sources: Lexical data from Strong’s Exhaustive Concordance and the Translators Brief Lexicon of Extended Strongs for Greek (STEPBible, CC BY). Occurrence data from the Translators Amalgamated Greek New Testament (STEPBible, CC BY). Scripture quotations from the World English Bible (public domain).