Serious vs. Sincere

Seriousadjective

Without humor or expression of happiness; grave in manner or disposition

Seriousadjective

Important; weighty; not insignificant

Seriousadjective

Really intending what is said; in earnest; not jocular or deceiving

Seriousadjective

Grave in manner or disposition; earnest; thoughtful; solemn; not light, gay, or volatile.

Seriousadjective

Really intending what is said; being in earnest; not jesting or deceiving.

Seriousadjective

Important; weighty; not trifling; grave.

Seriousadjective

Hence, giving rise to apprehension; attended with danger; as, a serious injury.

Seriousadjective

concerned with work or important matters rather than play or trivialities;

Seriousadjective

of great consequence;

Seriousadjective

causing fear or anxiety by threatening great harm;

Seriousadjective

appealing to the mind;

Seriousadjective

completely lacking in playfulness

Seriousadjective

requiring effort or concentration; complex and not easy to answer or solve;

Sincereadjective

Genuine; meaning what one says or does; heartfelt.

Sincereadjective

Meant truly or earnestly.

Sincereadjective

(archaic) clean; pure

Sincereadjective

Pure; unmixed; unadulterated.

Sincereadjective

Whole; perfect; unhurt; uninjured.

Sincereadjective

Being in reality what it appears to be; having a character which corresponds with the appearance; not falsely assumed; genuine; true; real; as, a sincere desire for knowledge; a sincere contempt for meanness.

Sincereadjective

Honest; free from hypocrisy or dissimulation; as, a sincere friend; a sincere person.

Sincereadjective

open and genuine; not deceitful;

Sincereadjective

characterized by a firm and humorless belief in the validity of your opinions;