Answer:
con·stant
/ˈkänstənt /
adjective
occurring continuously over a period of time.
"the pain is constant"
Similar:
continual
continuous
persistent
sustained
abiding
round-the-clock
ceaseless
unceasing
perpetual
incessant
never-ending
everlasting
eternal
endless
unending
unabating
nonstop
perennial
unbroken
uninterrupted
unrelieved
interminable
unremitting
relentless
unrelenting
without respite
sempiternal
steadfast
steady
resolute
determined
persevering
tenacious
dogged
unwavering
unflagging
unshaken
Opposite:
inconstant
fitful
noun
a situation or state of affairs that does not change.
"the condition of struggle remained a constant"
Similar:
unchanging factor
unchanging state of affairs
unchanging situation
Step-by-step explanation: