Full of blame; inclined to blame others; deserving of blame or criticism.
From 'blame' plus the adjective suffix '-ful.' This word can mean either 'containing blame' or 'deserving blame,' a duality common in '-ful' adjectives.
Some words are tricky: 'blameful' can mean 'inclined to give blame' (like a blameful person who criticizes everyone) OR 'worthy of blame' (a blameful act)—context determines which!
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