undependable

not worthy of reliance or trust; "in the early 1950s computers were large and expensive and unreliable"; "an undependable assistant"

उसने ऐसे सर्वेक्षणों को त्रुटिपूर्ण , गैरभरोसेमंद तथा मनगढंत बताया था .

Present - day tamers consider such an elephant as dangerous and. undependable.