sincerity

noun

1.
an earnest and sincere feeling
mailness earnestness seriousness
Derived from:
sincere
2.
the quality of being open and truthful; not deceitful or hypocritical
lutterness
Antonym:
insincerity
Derived from:
sincere
3.
a quality of naturalness and simplicity
unassumingness
4.
the trait of being serious
earnestness serious-mindedness seriousness
Derived from:
sincere