You've hit the nail on the head! Being comfortable with ambiguity and not knowing something 100% is crucial. I've observed many language learners over the years and if someone has a habit of translating every word they see into their native language before they are satisfied then they usually make slow progress learning a second language.
A corollary to this is that this is the reason why memorizing flash cards/massive lists of words can be counter productive. A degree of that is helpful to start, but you really need to see words in proper context, repeatedly.
