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in the PONS Dictionary

I. trif·tig [ˈtrɪftɪç] ADJ

ein triftiger Grund

II. trif·tig [ˈtrɪftɪç] ADV

to offer [sb] a sound argument in favour [or Am -or] of sth
to make a valid case for sth [to sb]

Examples from the PONS Dictionary (editorially verified)

ein triftiger Grund
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dev
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dev