ASSIDUOUS is one of the mnemonics I love.
It’s so simple and effective (and even easier to visualize).
ASSIDUOUS: WORK LIKE AN ASS.
Another ‘ass’ mnemonic is ‘asinine’ which is nothing else but ‘nine-asses’: you are as dumb as a sum of nine asses would be.
Meaning of Assiduous:
1. Constant in application or attention; diligent: an assiduous worker who strove for perfection.
2. Unceasing; persistent.
Sentence Examples for Assiduous:
1. Clearing exams required assiduous effort.
2. Her assiduous attempts to learn French failed miserably.