Idiotical

[id-ee-ot-ik] /ˌɪd iˈɒt ɪk/

adjective
1.
of, relating to, or characteristic of an .
2.
senselessly foolish or stupid:
an idiotic remark.
/ˌɪdɪˈɒtɪk/
adjective
1.
of or resembling an idiot; foolish; senseless
adj.

1713, from Late Latin idioticus “uneducated, ignorant,” in classical Latin, “of an ordinary person,” from Greek idiotikos “unprofessional, unskilled; not done by rules of art, unprofessional,” from idiotes (see idiot). Idiotical is from 1640s. Related: Idiotically.