I do strange little things to remember how to spell words like that. For jeopardize, I'd probably be like "it doesn't repeat a vowel until the end" since you know the first and last vowels are e. Abdomen was one of my bane words until I learned it doesn't repeat any vowels (I used to misspell it abdoman all the time.)

Conscious, the s and c in the middle are on opposite sides from each other as the C and s at the beginning and end.

Versatile, which has been one of my recent banes, only repeats the e.

Spelling can be such a pain.