Obscure, a. Abstruse, deep, involved, difficult, hidden, profound, mysterious, ambiguous, unintelligible, cloudy, complex, complicated, dark, darksome, dense, dim, doubtful, intricate, dusky, indistinct, enigmatical, incomprehensible, muddy, turbid, shadowy, misty, unknown, secluded, unascertained, remote.
Ant. Clear, luminous, distinct, lucid, plain, plain-spoken, intelligible, prominent, eminent.
Obsequious. Servile, cringing, fawning, compliant, submissive, deferential, sycophantic, flattering.
Ant. Impudent, self-assertive, independent, arrogant, insubmissive, haughty, proud.
Observance. Observation, heeding, form, practice, custom, attention, celebration, ceremony, performance.
Ant. Inobservance, inattention, disuse, disregard, disrespect, omission, unceremoniousness, informality.
Observant. Observing, watchful, attentive, regardful, obedient, mindful, careful, heedful.
Ant. Unmindful, disobedient, disregardful, heedless.
Observation. Contemplation, remark, study, notice, view, conclusion, judgment, attention, comment, note, observance.
Ant. Inattention, oversight, silence, ignorance, inadvertence.