good . . . speeches = their fine words and flatteries.
good words. Greek. chrestologia. Only here.
fair speeches. Greek. eulogia. Occurs sixteen times (eleven translated "blessing"). See Rom_15:29.
deceive = deceive thoroughly. Greek. exapatao. Occurs: Rom_7:11. 1Co_3:18. 2Co_11:3. 2Th_2:3. The usual word for "deceive" means "to lead astray" (App-128).
simple = guileless. Greek. akakos. Only here and Heb_7:26.