acute

It was an acute event.

an acute accent or tone

She had an acute sense of honour.  Eagles have very acute vision.

His need for medical attention was acute.

204. Eremophila abietina […] Corolla 23–35 mm long, cream or very pale lilac, lobes faintly metallic bluish green or lilac, tube occasionally brownish, prominently purple spotted; outer and inner surfaces glandular-pubescent; lobes acute, lobe of lower lip strongly reflexed.

The teacher pointed out the acute angle.

an acute triangle

Let this [the word alalal] be ſpoken as an Engliſh word, with the ſtrong accent on either ſyllable, or, on each, in repeating the word; and, no change of articulation diſturbing the ear, it will be abundantly evident that, with ordinary Engliſh pronunciation, the strengthened syllable has always the acuter tone, or, in muſical phraſe, the higher note.

He dropped dead of an acute illness.

The acute symptoms resolved promptly.

The last letter of ‘café’ is ‘e’ acute.