ineffective
enthusiastic
Sincere is an adjective. It begins with the letter s.
gabbroic
negative
An Adjective starting with the letter 'N' to describe jewelry is, nice.EXAMPLE: The nice jewelry was on sale.
The negative adjective of "agreeable" is disagreeable.
jazzy, jolly, jovial, joyful, just
The negative adjective for suitable is unsuitable.
The word unusual *is* an adjective, the negative of the adjective usual.A related adjective that has a different meaning is unused, the negative of the past participle used.
a negative adjective would be fat or chunky while a positive adjective meaning the same thing would be big build or heavy set.
Belligerent, boastful, boring and bossy are negative words. Bad, bratty and bully are negative words.
Abrasive, abusive, aggravating, alcoholic, aloof, annoying, arrogant and asinine are negative words. They begin with the letter a.