impermeable

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impermeable /ɪmˈpɚmijəbəl/ adjective
impermeable
/ɪmˈpɚmijəbəl/
adjective
Learner's definition of IMPERMEABLE
[more impermeable; most impermeable] technical
: not allowing something (such as a liquid) to pass through

— impermeability

/ɪmˌpɚmijəˈbɪləti/ noun [noncount]