"a man constant in adherence to his ideals"; "a constant lover"; "constant as the northern star"
is similar to
firm and dependable especially in loyalty
"a steadfast ally"; "a staunch defender of free speech"; "unswerving devotion"; "unswerving allegiance"
is similar to
unceasing
"unfailing loyalty"; "unfailing good spirits"; "unflagging courtesy"
see also
not changeable or subject to change
"a fixed and unchangeable part of the germ plasm"-Ashley Montagu; "the unchangeable seasons"; "one of the unchangeable facts of life"
see also
steadfast in affection or allegiance
"years of faithful service"; "faithful employees"; "we do not doubt that England has a faithful patriot in the Lord Chancellor"
see also
resistant to change of position or condition
"a stable ladder"; "a stable peace"; "a stable relationship"; "stable prices"
see also
not liable to or capable of change
"an invariable temperature"; "an invariable rule"; "his invariable courtesy"
is an attribute of
the quality of being enduring and free from change or variation
"early mariners relied on the constancy of the trade winds"