undimmable
Cannot be darkened
Undimmable describes a light source that cannot be reduced in brightness—it's either fully on or off, with no gradation between.
Some LED bulbs are undimmable and will flicker or fail if connected to a dimmer switch.
Figuratively, undimmable describes enthusiasm or spirit that refuses to fade: Her undimmable optimism carried the team through setbacks.
Not losing intensity
- unquenchableImpossible to satisfy completely
- radiantEmitting light or joy
- luminousEmitting or reflecting light
- glowingGiving off steady light
brilliant · blazing · incandescent · shining · lustrous · gleaming · beaming · vivid
Restored or immovable
- immutableIncapable of being changed
- unalterableIncapable of being changed
- permanentFixed without end
- irreversibleCannot be undone
unchangeable · constant · enduring · lasting · stable · invariable · established · entrenched
Firmly loyal, unshakeable
- unwaveringSteady and unchanging
- unyieldingRefusing to give way
- determinedFirmly committed to purpose
- resoluteFixed in purpose
tenacious · unflinching · unshakeable · adamant · indomitable · persistent · dogged · staunch
unfading
Not losing intensity
- unquenchableImpossible to satisfy completely
- radiantEmitting light or joy
- luminousEmitting or reflecting light
glowing · brilliant · blazing · incandescent · shining · lustrous · gleaming · beaming · vivid · intense
fixed
Restored or immovable
- immutableIncapable of being changed
- unalterableIncapable of being changed
- permanentFixed without end
irreversible · unchangeable · constant · enduring · lasting · stable · invariable · established · entrenched · indelible
steadfast
Firmly loyal, unshakeable
- unwaveringSteady and unchanging
- unyieldingRefusing to give way
- determinedFirmly committed to purpose
resolute · tenacious · unflinching · unshakeable · adamant · indomitable · persistent · dogged · staunch · firm
undimmabledimmable
Able to reduce brightness
adjustable · variable · controllable · flexible · changeable
dim, dims, dimmed, dimming, dimmer, dimmers, dimmest, dimly, dimness