plain

adjective

1
lacking embellishment or ornamentation
a plain hair style
unembellished white walls
2
lacking in physical beauty or proportion
a homely child
several of the buildings were downright homely
3
free from any effort to soften to disguise
the plain and unvarnished truth
the unvarnished candor of old people and children
4
clearly revealed to the mind or the senses or judgment
the effects of the drought are apparent to anyone who sees the parched fields
evident hostility
5
lacking patterns especially in color
6
not elaborate or elaborated; simple
plain food
stuck to the plain facts
7
not mixed with extraneous elements
plain water
sheer wine

1
unmistakably (`plain' is often used informally for `plainly')
the answer is obviously wrong
she was in bed and evidently in great pain

1
a basic knitting stitch
2
extensive tract of level open land
they emerged from the woods onto a vast open plain
he longed for the fields of his youth

1
express complaints, discontent, displeasure, or unhappiness
My mother complains all day
She has a lot to kick about

Also useful for “plain”:Wordle Solver— Five letters — perfect Wordle material