unsustained
Lacking continuous support
Unsustained describes something not maintained or kept going over time.
An unsustained effort fizzles out rather than continuing.
An unsustained note fades quickly.
The word often carries implicit criticism—that something should have been sustained but wasn't: The initial enthusiasm proved unsustained.
Passing very quickly
- momentaryLasting very briefly
- temporaryLimited in duration
- short-livedLasting only briefly
- briefShort in duration
passing · impermanent · transient · evanescent · ephemeral · vanishing · dissipating · fading
Without supporting evidence
- unverifiedNot yet proven true
- unconfirmedNot officially validated
- unsupportedLacking backing or proof
- uncorroboratedNot confirmed by evidence
unproven · unfounded · baseless · groundless · questionable · doubtful · speculative · inconclusive
Weak and ineffective
- fragileEasily broken or damaged
- falteringBecoming unsteady or weak
- waveringShowing unsteady resolve
- inconsistentLacking steady uniformity
erratic · unreliable · unstable · shaky · wobbly · tenuous · flimsy · insubstantial
fleeting
Passing very quickly
- momentaryLasting very briefly
- temporaryLimited in duration
- short-livedLasting only briefly
brief · passing · impermanent · transient · evanescent · ephemeral · vanishing · dissipating · fading · intermittent
unsubstantiated
Without supporting evidence
- unverifiedNot yet proven true
- unconfirmedNot officially validated
- unsupportedLacking backing or proof
uncorroborated · unproven · unfounded · baseless · groundless · questionable · doubtful · speculative · inconclusive · tenuous
feeble
Weak and ineffective
inconsistent · erratic · unreliable · unstable · shaky · wobbly · tenuous · flimsy · insubstantial · halfhearted
unsustainedsustained
Kept up continuously
continuous · prolonged · enduring · ongoing · lasting
unsustainedsustained
Kept up continuously
supported · maintained · upheld · bolstered · reinforced