μη particle - nominative
me  may: any but (that), forbear, God forbid, lack, lest, neither, never, no (wise in), none, nor, (can-)not, nothing, that not, un(-taken), without.
πλανασθε verb - present passive imperative - second person
planao  plan-ah'-o: to (properly, cause to) roam (from safety, truth, or virtue) -- go astray, deceive, err, seduce, wander, be out of the way.;
φθειρουσιν verb - present active indicative - third person
phtheiro  fthi'-ro: to shrivel or wither, i.e. to spoil (by any process) or (generally) to ruin (especially figuratively, by moral influences, to deprave) -- corrupt (self), defile, destroy.
ηθη noun - accusative plural neuter
ethos  ay'-thos: usage, i.e. (plural) moral habits -- manners.
χρηστα adjective - accusative plural neuter
chrestos  khrase-tos': employed, i.e. (by implication) useful (in manner or morals) -- better, easy, good(-ness), gracious, kind.
ομιλιαι noun - nominative plural feminine
homilia  hom-il-ee'-ah: companionship (homily), i.e. (by implication) intercourse -- communication.
κακαι adjective - nominative plural feminine
kakos  kak-os': worthless (intrinsically, such), i.e. (subjectively) depraved, or (objectively) injurious -- bad, evil, harm, ill, noisome, wicked.