declension

1 a gradual sinking and wasting away of mind or body a noticeable declension of the fitness of the baseball players over the winter Synonyms debilitation, decay, decaying, decline, degeneration, descent, deterioration, ebbing, enfeeblement, weakeningRelated Words atrophy; exhaustion; drooping, flagging, limping; regression, relapse, setbackNear Antonyms invigoration, strengthening; progress; rejuvenation, rejuvenescenceAntonyms comeback, improvement, rally, recovery, recuperation, rehabilitation, revitalization, snapback

2 a change to a lower state or level a declension in her acting career from leading roles to cameos eventually Synonyms decadence, decline, declination, degeneracy, degeneration, degradation, dégringolade, descent, deterioration, devolution, downfall, downgrade, ebb, eclipse, fallRelated Words dark age, nadir, sunset; decay, rotting, spoiling; breakup, crumbling, decomposition, disintegration, dissolution; abasement, debasement; depreciation, lessening; decimation, demolishment, demolition, desolation, destruction, havoc, ruin, ruination; abatement, decrease, decrement, de-escalation, deflation, diminishment, diminution, dip, downslide, downtrend, downturn, drop, drop-off, falloff, loss, lowering, reduction, sag, shrinkage, slip, slumpNear Antonyms advancement, development, evolution, growth; blossoming, flourishing, flowering; renewal, restoration, revitalization; heightening; accretion, accrual, addendum, addition, augmentation, boost, enhancement, gain, increase, increment, raise, supplementAntonyms ascent, rise, upswing

3 a downward slope from this region to the seacoast there's a gentle declension of the landscape Synonyms decline, declivity, descent, dip, downgrade, downhill, fall, hang, hangingRelated Words basin, depression, hollowNear Antonyms glacis, grade, gradient, hill, inclination, incline, lean, pitch, rake, tiltAntonyms acclivity, ascent, rise, upgrade, uphill, uprise