Simply.
It was just plain stupid.
Plainly; distinctly.
An expanse of land with relatively low relief and few trees, especially a grassy expanse.
Him the Ammonite / Worshipped in Rabba and her watery plain.
To level; to raze; to make plain or even on the surface.
Frownst thou thereat aspiring Lancaster, The sworde shall plane the furrowes of thy browes,
A surname.
From Middle English pleyn, borrowed from Anglo-Norman pleyn, playn, Middle French plain, plein, and Old French plain, from Latin plānus (“flat, even, level, plain”). Doublet of llano, piano, and plane...
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Tell me plain: do you love me or no?
A broad, flat expanse in general, as of water.
Fair ship, that from the Italian shore, Sailest the placid ocean-plains With my lost Arthur’s loved remains, Spread thy full wings, and waft him o’er.
A lamentation.
The warrior-threat, the infant's plain, The mother's screams, were heard in vain;
To make plain or manifest; to explain.
What’s dumb in show, I’ll plain with speech.
To complain.
Persones and parisch prestes · pleyned hem to þe bischop / Þat here parisshes were pore · sith þe pestilence tyme […].