diligent

As a noun endeavor

is a sincere attempt; a determined or assiduous effort towards a specific goal.

As a verb endeavor

is (obsolete) to exert oneself.

As an adjective diligent is

performing with intense concentration, focus, responsible regard.

As adjectives the difference between fastidious and diligent

is that fastidious is excessively particular, demanding, or fussy about details, especially about tidiness and cleanliness while diligent is performing with intense concentration, focus, responsible regard.

As adjectives the difference between perseverant and diligent

is that perseverant is enduring; persistent while diligent is performing with intense concentration, focus, responsible regard.

As adjectives the difference between diligent and effective

is that diligent is performing with intense concentration, focus, responsible regard while effective is having the power to produce a required effect or effects.

As a noun effective is

a soldier fit for duty.

As adjectives the difference between decisive and diligent

is that decisive is while diligent is performing with intense concentration, focus, responsible regard.

As adjectives the difference between diligent and diligent

is that diligent is performing with intense concentration, focus, responsible regard while diligent is performing with intense concentration, focus, responsible regard.

As an adjective diligent

is performing with intense concentration, focus, responsible regard.

As an adverb honestly is

in an honest manner.

As an interjection honestly is

Used to express exasperation, dismay, etc.