Sincere

honest frank open genuine real true candid earnest faithful outspoken plain serious square natural artless unaffected guileless undissembled up-front trustworthy bona fide righteous aboveboard unpretentious wholehearted heartfelt dear devout regular true-blue saintly meant undesigning unfeigned no-nonsense on the level actual like it is no fooling twenty-four carat on the line on up and up dead-level sure enough honest to God pretensionless