opinion about what to do, how to behave

recommendation

a feeling that trouble is coming

misgiving, bad omen

to have a vague feeling, idea, that; to make something into the shape of an arch

feeling, idea

evidence, clue

evidence, clue

a feeling of uneasiness considered as a warning (of danger etc)

feeling that an event is about to occur

a mark, object, symbol etc used to represent something: 'mathematical sings' such as '+', '-', 'x', '?'; a word or words, design etc on a board or plate to give a warning, or to give direction; to write (one's name) on (a letter, application form etc)

indication, evidence