inexhaustible

inexhaustible /ˌɪnɪgˈzɑːstəbəl/ adjective
inexhaustible
/ˌɪnɪgˈzɑːstəbəl/
adjective
Britannica Dictionary definition of INEXHAUSTIBLE
: impossible to use up completely : impossible to exhaust

— inexhaustibly

/ˌɪnɪgˈzɑːstəbli/ adverb