jessaierais
Jessaierais is not a recognized French lemma in mainstream dictionaries. It is usually understood as a misspelling or a concatenation of the pronoun je with the conditional form of the verb essayer. The standard written form would be j'essaierais (with an apostrophe) or, depending on orthography, j'essayerais, but not jessaierais as a correct French form.
Linguistic notes: the verb essayer means to try or to attempt. In the present conditional, the endings
Usage and context: j'essaierais would appear in sentences indicating a hypothetical action: If I had more time,
See also: French language, French verbs, conditional mood, essaya/r forms of essayer.