PERPETUAL
ceaseless, constant, incessant, never-ending, perpetual, unceasing, unremitting
(adjective) uninterrupted in time and indefinitely long continuing; “the ceaseless thunder of surf”; “in constant pain”; “night and day we live with the incessant noise of the city”; “the never-ending search for happiness”; “the perpetual struggle to maintain standards in a democracy”; “man’s unceasing warfare with drought and isolation”; “unremitting demands of hunger”
ageless, aeonian, eonian, eternal, everlasting, perpetual, unending, unceasing
(adjective) continuing forever or indefinitely; “the ageless themes of love and revenge”; “eternal truths”; “life everlasting”; “hell’s perpetual fires”; “the unending bliss of heaven”
Source: WordNet® 3.1
Etymology
Adjective
perpetual (not comparable)
Lasting forever, or for an indefinitely long time
Synonyms: continuant, persistent
Set up to be in effect or have tenure for an unlimited duration
Continuing; uninterrupted
Synonyms: continuous, nonstop
(botany) Flowering throughout the growing season
Source: Wiktionary
Per*pet"u*al, a. Etym: [OE. perpetuel, F. perpétuel, fr. L.
perpetualis, fr. perpetuus continuing throughout, continuous, fr.
perpes, -etis, lasting throughout.]
Definition: Neverceasing; continuing forever or for an unlimited time;
unfailing; everlasting; continuous.
Unto the kingdom of perpetual night. Shak.
Perpetual feast of nectared sweets. Milton.
Circle of perpetual apparition, or occultation. See under Circle.
– Perpetual calendar, a calendar so devised that it may be adjusted
for any month or year.
– Perpetual curacy (Ch. of Eng.), a curacy in which all the tithes
are appropriated, and no vicarage is endowed. Blackstone.
– Perpetual motion. See under Motion.
– Perpetual screw. See Endless screw, under Screw.
Syn.
– Continual; unceasing; endless; everlasting; incessant; constant;
eternal. See Constant.
Source: Webster’s Unabridged Dictionary 1913 Edition