Lasting or enduring forever; existing or continuing without end
Existing with infinite temporal duration (as opposed to existence outside of time).
Continuing indefinitely, or during a long period; perpetual; sometimes used, colloquially, as a strong intensive.
Extremely.
A durable cloth fabric for shoes, etc.
An everlasting flower.
Eternal.
Not decreasing over time in quality and appeal.
Not affected by time; ageless.
A gene encoding an essential protein that regulates circadian rhythm, normally written in italics: timeless.