深さ|ふかさfukasa[1]atamadaka (head-high)

1. noundepth; profundity

• Synonym深みふかみNeutralRefers to deep places or depth of substance, stressing subtle richness, as in 「味に深みがある」.
• Synonym深度しんどNeutralA measured depth value, as in 「深度計」; leans technical, used for actual measurements rather than general talk.
• Synonym奥行きおくゆきNeutralDepth as front-to-back distance, as in 「奥行きのある部屋」; stresses how far back a space extends.
• Related深遠しんえんWrittenWritten/formal prose for abstruse, hard-to-fathom ideas, as in 「深遠な哲学」; not used for physical depth.
• Related奥深さおくふかさNeutralDepth that is rich and rewarding to explore, as in 「茶道の奥深さ」; suggests hidden layers worth pondering.
• Antonym浅さNeutralThe antonym: shallowness, the degree of being shallow, as in 「経験の浅さ」.

Use 「深さ」 for depth in general, as in 「川の深さ」. For depth of flavor or character pick 「深み」, for a room's front-to-back depth 「奥行き」, for measured depth 「深度」, for thought-provoking profundity 「奥深さ」, and in formal prose 「深遠」; 「浅さ」 is the opposite.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 深ふかいこと。
2. 深ふかい度合どあい。