Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

indefatigable

UK /ˌɪn.dɪˈfæt.ɪ.ɡə.bəl/ · US /ˌɪn.dəˈfæt.ɪ.ɡə.bəl/ adjective, proper noun

Synonyms

From Middle French, from Latin indēfatīgābilis (“untiring”), from in- (“not”) + dēfatīgō (“to tire out”).

Named by the British Admiralty in honor of the HMS Indefatigable.

Etymology [L. indefatigabilis: cf. OF. indefatigable. See In- not, and Defatigable, and cf. Infatigable.]

Sources: Wiktionary · Webster’s 1913 — from the Wiktionary entry “indefatigable”, CC BY-SA 4.0. Details

Sanskrit dictionary entries whose meaning includes “indefatigable” (best matches first).

अमर्धत् a-mardhat not injuring; indefatigable (?).
तन्द्रित tandrita only in a-tandrita, as, ā, am, indefatigable, unremitting;
अश्रमण a-śramaṇa indefatigable; ( as ), m. one who is not an ascetic or Buddhist mendicant.
अमृध्र a-mṛdhra uninjured, not to be impaired, invulnerable; unremitting, unceasing, indefatigable (?).
अश्रम a-śrama freedom from fatigue, freshness; absence of toil, laziness; ( as, ā, am ), Vedic indefatigable.
अयास्य a-yāsya not to be obtained by effort, indefatigable; valiant; enterprising; ( as ), m., name of an Aṅgiras; mystical…
आयःशूलिक āyaḥśūlika active, diligent, indefatigable; ( as ), m. a man who, in order to obtain an object, uses forcible instead o…
दारुणाध्यापक dāruṇādhyāpaka an energetic or indefatigable teacher;