indefatigably
UK[ˌɪndɪˈfætɪɡəbli]US[ˌɪndɪˈfætɪɡəbli]
adv
In a way that shows tireless determination; without becoming tired or losing energy.
Morpheme Breakdown
in
de
fatigably
in
not
de
completely
fatigably
from 'fatigable', meaning able to be tired
Etymology
The word's journey begins with the Latin verb fatigare, meaning "to tire out or weary." This verb was combined with the prefix in- (not) and the intensifying prefix de- to form the Late Latin term indefatigabilis, literally "not able to be utterly wearied." It entered English in the early 17th century as "indefatigable," an adjective describing someone incapable of being fatigued. The adverb "indefatigably" was subsequently formed by adding the common English adverbial suffix '-ly,' preserving the core meaning of persisting with relentless, untiring energy. The logic moves from the concrete act of physical tiring to an abstract quality of unwavering mental or physical endurance.
Analysis
Structure: in (not) + de (completely) + fatigably (from 'fatigable', meaning able to be tired)
- 'in': A Latin prefix meaning "not".
- 'de': A Latin prefix used here as an intensifier, meaning "utterly, completely".
- 'fatigably': Derived from the Latin root 'fatigare' (to tire), combined with the suffix '-able' (capable of) and the adverbial suffix '-ly'. The core morpheme 'fatig' is a direct substring of the modern spelling.
Examples
She worked indefatigably for years to achieve her goal.
The volunteers campaigned indefatigably to raise funds for the cause.
He is an indefatigably optimistic person, never discouraged by setbacks.