unmemorizable
Impossible to retain
Unmemorizable describes something that resists being committed to memory, whether because it's too long, too complex, too random, or simply too dull to stick: The password was a string of unmemorizable characters.
Phone numbers, license plates, and bureaucratic codes often qualify.
Passing very quickly
- ephemeralLasting very briefly
- transientTemporary, soon departing
- elusiveHard to find
- slipperyLacking friction, hard-to-grasp
forgettable · unremarkable · insignificant · vague · indistinct · dim · fuzzy · blurry
Impossible to understand
- impenetrableImpossible to pass through
- unfathomableBeyond comprehension or measurement
- abstruseDifficult to comprehend
- esotericAccessible to few
arcane · recondite · opaque · inscrutable · convoluted · labyrinthine · Byzantine · tortuous
Impossible to understand
- bewilderingCausing utter confusion
- perplexingCausing mental confusion
- puzzlingCausing confusion or bewilderment
- disorientingCausing loss of direction
confusing · mystifying · cryptic · enigmatic · ambiguous · muddled · jumbled · chaotic
Discouraging through difficulty
- overwhelmingIntensely excessive in force
- staggeringShockingly impressive or unsteady
- formidableInspiring fear or respect
- insurmountableImpossible to overcome
unmanageable · intimidating · exhausting · voluminous · endless · interminable · sprawling · vast
fleeting
Passing very quickly
slippery · forgettable · unremarkable · insignificant · vague · indistinct · dim · fuzzy · blurry · nebulous
incomprehensible
Impossible to understand
- impenetrableImpossible to pass through
- unfathomableBeyond comprehension or measurement
- abstruseDifficult to comprehend
esoteric · arcane · recondite · opaque · inscrutable · convoluted · labyrinthine · Byzantine · tortuous · knotty
baffling
Impossible to understand
- bewilderingCausing utter confusion
- perplexingCausing mental confusion
- puzzlingCausing confusion or bewilderment
disorienting · confusing · mystifying · cryptic · enigmatic · ambiguous · muddled · jumbled · chaotic · disordered
daunting
Discouraging through difficulty
- overwhelmingIntensely excessive in force
- staggeringShockingly impressive or unsteady
- formidableInspiring fear or respect
insurmountable · unmanageable · intimidating · exhausting · voluminous · endless · interminable · sprawling · vast · massive
unmemorizablememorizable
Able to be remembered
memorable · learnable · retainable · recallable · unforgettable
memorize, memorable, memorably, unmemorable, memorization, memory, memories, memoir, memoirs