| Main Entry: | |
| Part of Speech: | adjective |
| Definition: | transient |
| Synonyms: | brief, disappearing, fading, fleeting, momentary, passing, short-lived, temporary, tenuous, vanishing |
| Main Entry: | ephemeral |
| Part of Speech: | adjective |
| Definition: | momentary, passing |
| Synonyms: | brief, episodic, evanescent, fleeting, flitting, fugacious, fugitive, impermanent, short, short-lived, temporary, transient, transitory, unenduring, volatile |
| Antonyms: | enduring, eternal, everlasting, interminable, lasting, long, permanent, perpetual |
| Main Entry: | fleeting |
| Part of Speech: | adjective |
| Definition: | brief, transient |
| Synonyms: | cursory, ephemeral, evanescent, fading, flash in the pan, flitting, flying, fugacious, fugitive, impermanent, meteoric, momentary, passing, short, short-lived, sudden, temporary, transitory, vanishing, volatile |
| Antonyms: | constant, continual, endless, enduring, lasting, lengthy, long, long-lived, permanent, perpetual |
| Main Entry: | fly-by-night |
| Part of Speech: | adjective |
| Definition: | unreliable and shady |
| Synonyms: | brief, cowboy, disreputable, dubious, ephemeral, evanescent, fleeting, here-today-gone-tomorrow, impermanent, irresponsible, momentary, not to be relied upon, not to be trusted, passing, questionable, shady, shifty, short-lived, slimy*, slippery*, temporary, treacherous, trustless, undependable, unprofessional, unreliable, unsure, untrustworthy |
| Antonyms: | dependable, reliable, reputable, responsible, trustworthy |
| Main Entry: | fugitive |
| Part of Speech: | adjective |
| Definition: | fleeing, transient |
| Synonyms: | avoiding, brief, criminal, elusive, ephemeral, errant, erratic, escaping, evading, evanescent, fleeting, flitting, flying*, fugacious, hot*, impermanent, lamster, momentary, moving, on the lam, passing, planetary, running away, short*, short-lived, temporary, transitory, unstable, volatile, wandering, wanted |
| Antonyms: | confronting, facing, permanent |
| Main Entry: | imperceptible |
| Part of Speech: | adjective |
| Definition: | hard to sense; faint |
| Synonyms: | ephemeral, evanescent, fine, gradual, impalpable, imponderable, inappreciable, inaudible, inconsiderable, inconspicuous, indiscernible, indistinct, indistinguishable, infinitesimal, insensible, insignificant, invisible, microscopic, minute, momentary, shadowy, slight, small, subtle, tiny, trivial, undetectable, unnoticeable, vague |
| Antonyms: | apparent, conspicuous, distinct, evident, noticeable, obvious, perceptible, seeable, striking, unobscured |
| Main Entry: | intangible |
| Part of Speech: | adjective |
| Definition: | indefinite, obscured |
| Synonyms: | abstract, abstruse, airy, dim, eluding, elusive, ethereal, evading, evanescent, evasive, hypothetical, impalpable, imperceptible, imponderable, inappreciable, incorporeal, indeterminate, insensible, invisible, rare, shadowy, slender, slight, unapparent, uncertain, unobservable, unreal, unsubstantial, unsure, vague |
| Antonyms: | definite, obvious, palpable, perceptible, tangible |
| Main Entry: | momentary |
| Part of Speech: | adjective |
| Definition: | brief, fleeting |
| Synonyms: | cursory, dreamlike, ephemeral, evanescent, flashing, flitting, flying, fugacious, fugitive, gone in flash, hasty, impermanent, impulsive, in wink of an eye, instantaneous, like lightning, passing, quick, shifting, short, short-lived, spasmodic, summary, temporary, transient, transitory, vanishing, volatile |
| Antonyms: | lasting, long-lasting, permanent, staying |
| Main Entry: | mortal |
| Part of Speech: | adjective |
| Definition: | human |
| Synonyms: | animate, bipedal, corporeal, creatural, earthly, ecce homo, ephemeral, evanescent, fading, finite, frail, fugacious, impermanent, momentary, passing, perishable, precarious, sublunary, temporal, transient, weak, worldly |
| Antonyms: | animal, immortal, inhuman, plant |