deceitful
adj.describing someone or something that is dishonest or tricks people. You use this to talk about lies or things that look one way but are actually different.
adj.characterised by dishonesty or the use of trickery to mislead others. Often used to describe people, actions, or objects that appear one way but are different in reality.
“He is a deceitful person who always lies.”
“The politician's deceitful promises during the campaign led to a loss of public trust.”
“The serpent's deceitful nature is often used as a metaphor for those who appear harmless but harbor dangerous intentions.”
“But now, after we told her about more families coming forward, she said "it feels like this is something much bigger and more deceitful".”
From deceit + -ful.
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.