“颠三倒四”常见的英文表达有 “be in a muddle”、“disorderly” 或 “confused and disorganized”，具体使用可根据语境调整：
“be in a muddle”：形象地表达混乱无序的状态，例如：
His thoughts were in a muddle, and he couldn't explain things clearly. （他思绪混乱，无法把事情说清楚。）
“disorderly”：侧重描述缺乏条理或秩序，例如：
The room was in a disorderly state, with things scattered everywhere. （房间杂乱无章，东西扔得到处都是。）
“confused and disorganized”：直接对应“颠三倒四”的混乱状态，例如：
Her speech was so confused and disorganized that no one could follow her point. （她说话颠三倒四，没人能跟上她的思路。）
若需更生动的表达，也可用 “all mixed up”（全搞混了）或 “jumbled up”（乱七八糟）等短语。