On a mere suspicion.

to doubt, to suspect, to mistrust

to be suspicious (of), be mistrustful (of), to be disaffected

vainly hopeful, presumptuous

to come into one's mind

thought, idea, imagine, hypothetical, fictitious

to amend the taste

bring (one) to his/her senses

have correct pronunciation

doubtful, immersed in conjectures and delusions

of sound mind, having full use of the senses, sensible

idea, thought, conjecture, surmise, presumption, fancy

of right mind, of sound understanding

to pronounce correctly

mend one's ways