As an adjective sentimental is
characterized by sentiment, sentimentality or excess emotion.
Not English Inrational has no English definition. It may be misspelled.
English words similar to 'inrational':immartial
characterized by sentiment, sentimentality or excess emotion
derived from emotion rather than reason; of or caused by sentiment
* 1885 : ,
*: Are you in sentimental mood?
*: I'll sigh with you.
* 1944 : ,
*: Gonna take a Sentimental Journey,
*: Gonna set my heart at ease.
*: Gonna make a Sentimental Journey,
*: to renew old memories.