Deep

adj.thoughtful, kindwarm

Meaning 1

Felt with unusual strength and sincerity.

Reach for it when describing emotions, bonds, or respect that are more than passing

The two families developed a deep trust during the rebuilding effort.

everyday
intense
when sheer strength of feeling is the point
not when Intensity may be brief or harmful and does not guarantee sincerity.
warm
heartfelt
when sincerity and personal emotion are directly expressed
not when Heartfelt fits messages and feelings, not technical knowledge or analysis.
formal
profound
when great intellectual or emotional significance deserves elevated language
not when Profound can sound inflated for a strong but ordinary feeling.

Reaching beneath the obvious through careful thought or understanding.

Reach for it when praising analysis, knowledge, or insight that addresses underlying causes

Her deep reading of the case revealed a pattern others had missed.

warm
thoughtful
when care for implications or other people shapes the thinking
not when Thoughtfulness can be considerate without reaching a deep understanding.
professional
insightful
when an observation reveals something previously unclear
not when One insightful remark does not establish broad or deep knowledge.
professional
thorough
when complete coverage and careful checking matter
not when Thorough work may collect every detail without penetrating the central issue.
literary
wise
when good judgment gained through understanding guides action
not when Wisdom is a whole-person assessment that a single deep analysis cannot prove.

deep affection
He felt deep affection for the aunt who taught him to read.
deep respect
The crew's deep respect for the sea shaped every decision.
deep understanding
A deep understanding of soil helped the farmers restore the slope.

The definition and the example on this page are written here. The dictionaries above ground which meaning is being described, not the wording.