Synonyms for unfailing
- adjective
Most common
constant perpetual trustworthy infallible inexhaustible unflagging
All synonyms
Adjective
1. Constant — infallible
constant, infallible, perpetual, trustworthy, certain, foolproof, sure, perennial
Other
Definitions
- adj. 1
infallible
Related words
- Word family
- unfailingly
Example sentences
- constant I rediscovered the importance of constant efforts.
- perpetual Kim Il-sung is North Korea's perpetual dictator.
- trustworthy He is a good fellow for sure, but not trustworthy.
- infallible The justice system is not infallible; mistakes happen.
- inexhaustible Books are inexhaustible sources of knowledge.
Popularity over time
| Word | 1850 → 2019 | Trend |
|---|---|---|
| unfailing | steady | |
| constant | falling | |
| perpetual | steady | |
| trustworthy | rising | |
| infallible | steady | |
| inexhaustible | falling |
Use in printed books, per decade from 1850 to 2019.
By length
- 4 letters
- sure1
- 7 letters
- certain2
- 8 letters
- constant2
- 9 letters
- perpetual4, perennial4, foolproof2
- 10 letters
- infallible4, unflagging3
- 11 letters
- trustworthy3
- 13 letters
- inexhaustible5
The small number after each word is its number of syllables (certain2 = 2 syllables).