frank と outspoken と candid と sincere はどう違いますか？説明が難しい場合は、例文を教えて下さい。

“Candid” means honest, for example “she is a very candid person”.

“Outspoken” means that someone speaks what they think without much concern for others opinions or feelings, for example “she is a bit too outspoken”.

“Frank” again means honest but if someone is being frank what they’re saying might be a little bit critical, for example “her judgement of my work was frank but fair”

“Sincere” means that something is genuine and real, for example “her apology was sincere”.