隠密[onmitsu] privacy
過密[kamitsu] overcrowding
確率密度関数[kakuritsumitsudokansuu] probability density function
機密[kimitsu] secrecy
機密性[kimitsusei] confidentiality

機密保護[kimitsuhogo] security (e.g. data, password, etc.)
気密[kimitsu] airtight
気密室[kimitsushitsu] airtight chamber
緊密[kinmitsu] rigour
軍事秘密[gunjihimitsu] military secret

縹緻[kiryou] looks
精緻[seichi] delicate
緻密[chimitsu] minute
不縹緻[bukiryou] ugliness

巧緻[kouchi] elaborate
細緻[saichi] minute
精妙巧緻[seimyoukouchi] exquisite and elaborate