noun, na-adjective
simple honesty; tactless frankness
Describes a person or behavior that is straightforward and honest to the point of being blunt or lacking tact. Can be positive (sincere, unpretentious) or negative (socially clumsy, overly direct).
彼の愚直な態度が、かえって信頼を集めた。
His simple, honest attitude actually earned him trust.
愚直に事実を伝えたら、相手を怒らせてしまった。
When I told the facts with tactless frankness, I ended up making the other person angry.