Unlimited (9)
'unlimited' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for boundless that I've seen before include "Without limits" , "Seemingly without limit" , "Having no limit, extensive" , "Unlimited" .)
'unlimited' is the definition.
(thesaurus)
This is the entire clue.
(Other definitions for endless that I've seen before include "Everlasting" , "permanent" , "Eternal - unbroken" , "Continuing too long" , "Infinite, perpetual" .)
'unlimited' is the definition.
(synonyms)
This is all the clue.
(Another definition for inexhaustible that I've seen is " Tireless".)