appearances can be decieving
Appearances can be deceptive.
Meaning of deceive in English
to persuade someone that something false is the truth, or to keep the truth hidden from someone for your own advantage:
giving an appearance or impression different from the true one; misleading.
'Deceptive' is the adjectival form while 'deceiving' is the verb form.
Appearances are deceptive. People are deceiving.