IPA: /nɒnˈvɜːbəli/
KK: /nɑnˈvɜrbəli/
In a way that does not involve spoken or written words, often using gestures or body language instead.
She communicated nonverbally by nodding and smiling.
Nonverbally → It is formed from "non-" (meaning not) and "verbal" (from Latin "verbalem", meaning relating to words). The word "nonverbally" means communicating without the use of words.
Think of 'not' ('non-') using 'words' ('verbal') — that's how nonverbally means to communicate without speaking.