unfailing

adj.

1. Always able to supply more; inexhaustible: an unfailing source of good stories.
2. Constant; unflagging: unfailing loyalty.
3. Incapable of error; infallible.

unfailingly un·fail'ing·ly adv.

adjective

1. Remaining continually unchanged: changeless, consistent, constant, invariable, same, unchanging. See change/persist.
2. Existing or occurring without interruption or end: around-the-clock, ceaseless, constant, continual, continuous, endless, eternal, everlasting, incessant, interminable, nonstop, ongoing, perpetual, persistent, relentless, round-the-clock, timeless, unceasing, unending, uninterrupted, unremitting. See continue/stop/pause.
3. Having or showing a capacity for protracted effort, regardless of difficulty or frustration: indefatigable, inexhaustible, tireless, unflagging, untiring, unwearied, weariless. See continue/stop/pause, tired/fresh.
4. Such as could not possibly fail or disappoint: certain, infallible, secure, sure, unerring. Informal sure-fire. See certain/uncertain.

adj

Definition: certain, unchanging
Antonyms: failing, impermanent, uncertain, unsure

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IN BRIEF: Constant. Also: Everlasting.

I have an unfailing interest in reading great literature.

Dansk (Danish)
adj. - ufejlbarlig, usvigelig, uudtømmelig

Nederlands (Dutch)
betrouwbaar, onfeilbaar, constant, onuitputtelijk

Français (French)
adj. - fidèle, à toute épreuve, constant (des efforts), intarissable (une source), inépuisable (l'offre)

Deutsch (German)
adj. - unfehlbar, unerschöpflich

Ελληνική (Greek)
adj. - αλάνθαστος, αδιάπτωτος, ανεξάντλητος, αμείωτος

Italiano (Italian)
infallibile, inesauribile, instancabile

Português (Portuguese)
adj. - infalível, persistente, inesgotável

Русский (Russian)
неизменный, верный кому-л. или чему-л., неиссякаемый

Español (Spanish)
adj. - infalible, seguro, inagotable, constante, incansable

Svenska (Swedish)
adj. - osviklig, outtömlig, orubblig

中文（简体）(Chinese (Simplified))
无穷尽的, 可靠的

中文（繁體）(Chinese (Traditional))
adj. - 無窮盡的, 可靠的

한국어 (Korean)
adj. - 끊이지 않는, 틀림이 없는, 충실한

日本語 (Japanese)
adj. - 尽きない, 信頼できる

العربيه (Arabic)
‏(صفه) لا يكل, لا يفتر, لا يخذل, لا ينضب, لا يخون‏

עברית (Hebrew)
adj. - ‮לא-פוסק, תמידי, לא כלה, בלתי-נדלה, נאמן, לא מאכזב, לא כושל‬

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