doubt

As a noun doubt

is uncertainty, disbelief.

As a verb doubt

is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As an adjective lonely is

unhappy because of feelings of loneliness.

As nouns the difference between doubt and messy

is that doubt is uncertainty, disbelief while messy is .

As a verb doubt

is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As an adjective cynical

is of or relating to the cynics, a sect of ancient greek philosophers who believed virtue to be the only good and self-control to be the only means of achieving virtue.

As a noun doubt is

uncertainty, disbelief.

As a verb doubt is

(ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As verbs the difference between challenge and doubt

is that challenge is while doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As verbs the difference between admit and doubt

is that admit is to allow to enter; to grant entrance, whether into a place, or into the mind, or consideration; to receive; to take while doubt is to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As nouns the difference between rational and doubt

is that rational is (mathematics) a rational number: a number that can be expressed as the quotient of two integers while doubt is uncertainty, disbelief.

As an adjective rational

is capable of reasoning.

As a verb doubt is

(ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As verbs the difference between rationalize and doubt

is that rationalize is to make something rational or more rational while doubt is (ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

As a noun doubt is

uncertainty, disbelief.

As nouns the difference between rationalization and doubt

is that rationalization is the process, or result of rationalizing while doubt is uncertainty, disbelief.

As a verb doubt is

(ambitransitive) to lack confidence in; to disbelieve, question, or suspect.

In obsolete terms the difference between vague and doubt

is that vague is a wandering; a vagary while doubt is to fill with fear; to affright.

As an adjective vague

is not clearly expressed; stated in indefinite terms.