arduo (bn):
zwaar(en) hard to climb or traverse.
(en) needing or using up much energy.
(en) demanding a lot of effort to endure., moeilijk te beklimmen(en) needing or using up much energy.
(en) hard to climb or traverse., moeizaam(en) hard to climb or traverse.
(en) needing or using up much energy., steil(en) hard to climb or traverse.
(en) needing or using up much energy., uitputtend(en) needing or using up much energy.
(en) hard to climb or traverse., moeilijk(en) demanding a lot of effort to endure.
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Via: Memodata.com