Alternative words you could use instead of the word…

Plain

As an adjective

Specifically meaning clear and/or obvious

Apparent

Appreciable

Audible

Bald

Bald faced

Bare faced

Black and white

Bright line

Broad

Cognisable

Cognisable

Clean

Clean out

Clear

Clear out

Comprehendible

Comprehensible

Crystal clear

Decided

Decipherable

Definite

Digestible

Discernible

Distinct

Evident

Explicit

Fair

Fathomable

Graspable

Intelligible

Knowable

Legible

Lucid

Luculent

Luminous

Manifest

Non ambiguous

Obvious

Open

Opening and shut

Overt

Palpable

Patent

Pellucid

readable

Recognisable

Ringing

Self evident

Self explanatory

Sensible

Simple

Talking turkey

Tangible

Tidy

Transparent

Trenchant

Unambiguous

Unambivalent

Uncomplicated

Understandable

Undisguised

Unequivocal

Unmistakable

Visible

Well defined