To break your promise to him would be 'akin to' betraying your friendship.
a feeling 'akin to' loneliness [=a feeling that resembles loneliness]
The two languages are closely 'akin to' one another.
(..) Oh, my God. Robert: My turn. ( Dice rattling ) Robert: "Honesty, often akin to poisonous drinks, tell thy friend what thou truly thinks." Robert: Based on my observation, if you really want to elevate (..)2009 The Black Waters of Echo's Pond