Translation is not something to be avoided for the adult language learner. We should use every advantage at our disposal.
You can spend hours trying to guess the meaning of a word through pictures and context (and not getting anywhere far), or you can spend a minute reading the translated meaning and then spend hours understanding it in context (and reinforcing it, and learning its semantics).
I wonder if this idea of "avoiding the mother tongue" stems from all the misguided marketing surrounding products like Rosetta Stone which advertise "learn like children learn." Spoiler: it takes children years and years of near-constant, directed input to acquire their native language to a high degree.
Edit: But I can see the value in doing this as a thought experiment ("what if translation isn't possible?"), and for that it's interesting.