transcription, транскрипция: [ ɪndɪfætɪgəb(ə)l ]
You use indefatigable to describe someone who never gets tired of doing something. ( FORMAL )
His indefatigable spirit helped him to cope with his illness...
= untiring, tireless
ADJ
• in‧de‧fati‧gab‧ly
She worked indefatigably and enthusiastically to interest the young in music.
ADV : ADV with v , ADV adj