Learner's definition of PROFOUND
[more profound; most profound]
1 a : having or showing great knowledge or understanding b : difficult to understand : requiring deep thought or wisdom 2 a : very strongly felt
b : very great
a profound sense of loss
Computer technology has made profound [=major, significant] changes in our lives.
His paintings have had a profound effect/impact/influence on her own work.
3 somewhat formal : absolute or complete