decayless
Immune to deterioration
Decayless means not subject to decay—remaining unchanged, undying, or eternal.
The word is rare and literary, appearing mostly in poetry or religious contexts to describe things immune to deterioration: decayless beauty, decayless glory.
It carries a formal, archaic quality.
Lasting without end
- undyingLasting without end
- imperishableLasting forever, indestructible
- timelessUnaffected by eras
- everlastingLasting for all time
ageless · enduring · immortal · perpetual · permanent · changeless · unending · infinite
Withstands oxidation and decay
- stainlessFree from discoloration
- rust-proofResistant to oxidation
- weatherproofResistant to outdoor elements
- durableAble to withstand use
non-biodegradable · inert · stable · preservative · archival · acid-free · UV-resistant · synthetic
Repeated back-and-forth movement
- amplitudeMaximum oscillation displacement
- perpetual motionUnending movement without input
- undampedWithout amplitude reduction
- resonanceAmplified oscillation at natural frequency
vibration · harmonic · waveform · energy conservation · lossless · frictionless · sustained · continuous
eternal
Lasting without end
- undyingLasting without end
- imperishableLasting forever, indestructible
- timelessUnaffected by eras
everlasting · ageless · enduring · immortal · perpetual · permanent · changeless · unending · infinite · deathless
corrosion-resistant
Withstands oxidation and decay
- stainlessFree from discoloration
- rust-proofResistant to oxidation
- weatherproofResistant to outdoor elements
durable · non-biodegradable · inert · stable · preservative · archival · acid-free · UV-resistant · synthetic · polymer
oscillation
Repeated back-and-forth movement
- amplitudeMaximum oscillation displacement
- perpetual motionUnending movement without input
- undampedWithout amplitude reduction
resonance · vibration · harmonic · waveform · energy conservation · lossless · frictionless · sustained · continuous · periodic
decaylessdecaying
Undergoing organic breakdown
perishable · corruptible · rotting · degradable · decomposing
decaylessbiodegradable
Able to decompose naturally
compostable · putrescible · organic · decomposable · perishable
decay, decayed, decaying, decadent, decadence, decays, decayable, undecayed