НЕДАРОМ

нареч. 1. (не без оснований) not for nothing, not without reason; он ~ так говорил he had a reason for speaking as he did; 2. (не без цели, не без умысла) for some purpose/reason; он ~ сюда приезжал he came here for some reason; 3. (не напрасно, небесполезно) not for nothing, not in vain; он ~ работал his work was not in vain, his work was not wasted