A collection of positive adjectives is an excellent little tool that you can use towards your long-term goal of staying positive. Their use is similar to that of affirmations, in terms of invoking the positive power inside of you.
But, here's where these two differ: unlike affirmations, using adjectives does not require a sentence in a structured format - instead, just an "I am.." preceding the adjective serves the purpose - and they can be called upon more spontaneously in an impromptu, as needed basis.
adaptable . alert . ambitious
bold . brilliant
capable . charming . cheerful . competent . confident content . courageous . creative . credible
decisive . dependable . devoted . diligent . diplomatic dynamic
efficient . eloquent . endurable . energetic . enterprising enthusiastic
fantastic . fearless . focused . fun
gorgeous . grateful
happy . healthy . hilarious
imaginative . immaculate . impressive . industrious influential . intelligent
keen . knowledgeable
laudable . lively . loyal . lucky
magnetic . mature . modest
open-minded . original
perfect . powerful . practical . pragmatic . precious productive . professional . proud
receptive . relaxed . remarkable . resolute . responsible
satisfied . self-assured . sensible . shrewd . skillful . solid spontaneous . steadfast . successful
talented . thorough . tough . trustworthy
unique . upbeat . upright
valiant . vivacious
witty . wonderful . worthy
Motivational speakers and life coaches often use such positive phrases to emphasize the power of positive thinking. Use these adjectives any time of the day, whenever those negative thoughts creep into your mind, to instantly replace them with positive phrases, and thus counter their effect on you.
Of course, while we cannot go over the entire list every time we need to; but having such a list handy, and glancing at it on occasion, makes it easier to bring the right positive word into our mind when we need it, in a way that becomes natural and second nature to us.
Have you ever tried positive hypnosis audios? Those can be good tools too, to help stop negative thoughts before they start in your mind.