one track mind (noun) one-track mind: mind set on one idea
Sinonime: accepting, believing, born yesterday, dupable, easy mark, falling for,
green, overtrusting,
simple, swallow whole, taken in, trustful,
trusting, uncritical, unquestioning,
unsophisticated, unsuspecting, unsuspicious, unwary
Antonime: skeptical, suspecting,
suspicious, untrusting