LOOPIEST

LOOPY

balmy, barmy, bats, batty, bonkers, buggy, cracked, crackers, daft, dotty, fruity, haywire, kooky, kookie, loco, loony, loopy, nuts, nutty, round the bend, around the bend, wacky, whacky

(adjective) informal or slang terms for mentally irregular; “it used to drive my husband balmy”

loopy

(adjective) consisting of or covered with or having loops

Source: WordNet® 3.1

Adjective

loopiest

superlative form of loopy: most loopy

Source: Wiktionary