serious

As adjectives the difference between mischievous and serious

is that mischievous is causing mischief; injurious while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As adjectives the difference between barbaric and serious

is that barbaric is of or relating to a barbarian; uncivilised, uncultured or uncouth while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As adjectives the difference between disappointed and serious

is that disappointed is defeated of expectation or hope; let down while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As a verb disappointed

is (disappoint).

As adjectives the difference between profound and serious

is that profound is descending far below the surface; opening or reaching to great depth; deep while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As a noun profound

is (obsolete) the deep; the sea; the ocean.

As a verb profound

is (obsolete) to cause to sink deeply; to cause to dive or penetrate far down.

As adjectives the difference between pensive and serious

is that pensive is having the appearance of deep, often melancholic, thinking while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As adjectives the difference between serious and awry

is that serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn while awry is turned or twisted toward one side; crooked, distorted, out of place.

As an adverb awry is

obliquely, crookedly; askew.

As adjectives the difference between serious and responsible

is that serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn while responsible is answerable for an act performed or for its consequences; accountable; amenable, especially legally or politically.

As adjectives the difference between complex and serious

is that complex is made up of multiple parts; composite; not simple while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As a noun complex

is a problem.

As a verb complex

is (chemistry|intransitive) to form a complex with another substance.

As adjectives the difference between apocryphal and serious

is that apocryphal is of or relating to the apocrypha while serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn.

As adjectives the difference between serious and easygoing

is that serious is without humor or expression of happiness; grave in manner or disposition; earnest; thoughtful; solemn while easygoing is (of a person) calm, relaxed, casual and informal.