| abatement(noun, decline) |
| brief(adjective, transient, transitory, short-lived) |
| changeable(adjective, transient) |
| cursory(adjective, brief, transient, transitory, short-lived) |
| decay(noun, decline, collapse, down, deterioration) |
| decaying(verb, adjective, deteriorating) |
| degeneration(noun, decline, ruin, collapse, failing) |
| deterioration(noun, decline, collapse, impairment, degeneration) |
| fickle(adjective, transient) |
| flying(verb, brief, transitory, short-lived, disappearing) |
| languishing(verb, weakening, wearying, flagging) |
| dwindling(noun, adjective, decline, deterioration, degeneration) |
| evanescing(verb, disappearing) |
| flagging(adjective, languid, weakening, lessening, deteriorating) |
| flickering(adjective, transient) |
| instantaneous(adjective, transient) |
| moribund(adjective, dying) |
| restless(adjective, transient) |
| rootless(adjective, transient) |
| shifting(adjective, transient) |