Nonverbal
Nonverbal / nɒnvɜb ə l /(adj)
Nonverbal means the state of communicating with others without the aid of words and sentences, nonlinguistic transmission of information, not involving words, silent, mute, mime, gestured, telepathic:
Scowling is an apparent example of nonverbal communication.
Were you to use nonverbal communication, you would not be able to convey your messages impeccably.