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Synonyms

foggy

American  
[fog-ee, faw-gee] / ˈfɒg i, ˈfɔ gi /

adjective

foggier, foggiest

  1. thick with or having much fog; misty.

    a foggy valley;

    a foggy spring day.

  2. covered or enveloped as if with fog.

    a foggy mirror.

  3. (of thinking, ideas, etc.) dim or unclear as if obscured by fog; vague.

    I haven't the foggiest notion of where she went.
    Synonyms:
    muddleheaded, muddled, fuzzy, befuddled

  4. bewildered; confused.

    Difficulties with memory, concentration, attention, and fatigue left me feeling foggy and muddled much of the time.

  5. Photography. affected by fog.

foggy British  
/ ˈfɒɡɪ /

adjective

  1. thick with fog

  2. obscure or confused

  3. another word for fogged

  4. no idea whatsoever

    I haven't the foggiest
"Collins English Dictionary — Complete & Unabridged" 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Other Word Forms

  • foggily adverb
  • fogginess noun
  • unfoggy adjective

Etymology

Origin of foggy

First recorded in 1520–30; fog 2 + -y 1; original sense was “marshy, thick, murky”

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Death Valley on Thursday scorched in 40C degrees while the often cool and foggy San Francisco tied its historic March record at 29C degrees, and skiers in Colorado were hitting the slopes shirtless.

From Barron's • Mar. 20, 2026

Vonn’s trouble started last Friday morning on a foggy World Cup downhill course in Crans-Montana, Switzerland.

From The Wall Street Journal • Feb. 5, 2026

At least five people have been killed after a Mexican Navy plane crashed in foggy conditions near Galveston, Texas on Monday while transporting a child burns victim.

From BBC • Dec. 23, 2025

After making 11 changes for the League Cup quarter-final win at third-tier Cardiff on Tuesday, Maresca reverted to his senior stars, but they made a dismal start on foggy Tyneside.

From Barron's • Dec. 20, 2025

In the livid, foggy twilight, Fiver stared at the board.

From "Watership Down: A Novel" by Richard Adams

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.