What's the adjective for passen? Here's the word you're looking for.
Included below are past participle and present participle forms for the
verbs pass, passage and password which may be used as adjectives within certain contexts.
“The only Frenchmen who had more than a passing interest in the science of nature were likely to be professors of philosophy and medicine.”
“We must state that, barring a passing reference to this aspect, no serious contention was raised or, indeed, could be raised on the merits of the matter.”