Profound | Mean of profound in English Dictionary

/prəˈfaʊnd/

• having or showing great knowledge or understanding
1. a profound thinker
2. His knowledge of history is profound.
3. Her books offer profound insights into the true nature of courage.
• difficult to understand
1. the profound mysteries of outer space
2. profound questions
• very strongly felt
1. profound sorrow
2. a profound sense of loss

• very great
1. Computer technology has made profound [=major, significant] changes in our lives.
2. His paintings have had a profound effect/impact/influence on her own work.
• absolute or complete
1. a profound silence/sleep/deafness